diff --git a/.gitignore b/.gitignore
index 9768287..869f498 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,3 @@
-# ide related
-.idea
 # composer related
 composer.lock
 composer.phar
diff --git a/Spreadsheet/Excel/Writer.php b/Spreadsheet/Excel/Writer.php
index 291b7c4..d62e9cf 100644
--- a/Spreadsheet/Excel/Writer.php
+++ b/Spreadsheet/Excel/Writer.php
@@ -31,7 +31,8 @@
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
-require_once __DIR__ . '/Writer/Workbook.php';
+require_once 'PEAR.php';
+require_once 'Spreadsheet/Excel/Writer/Workbook.php';
 
 /**
 * Class for writing Excel Spreadsheets. This class should change COMPLETELY.
@@ -46,12 +47,13 @@ class Spreadsheet_Excel_Writer extends Spreadsheet_Excel_Writer_Workbook
     /**
     * The constructor. It just creates a Workbook
     *
-    * @param string $fileName The optional filename for the Workbook.
+    * @param string $filename The optional filename for the Workbook.
+    * @return Spreadsheet_Excel_Writer_Workbook The Workbook created
     */
-    public function __construct($fileName = '')
+    function Spreadsheet_Excel_Writer($filename = '')
     {
-        $this->fileName = $fileName;
-        parent::__construct($fileName);
+        $this->_filename = $filename;
+        $this->Spreadsheet_Excel_Writer_Workbook($filename);
     }
 
     /**
@@ -60,13 +62,13 @@ class Spreadsheet_Excel_Writer extends Spreadsheet_Excel_Writer_Workbook
     * @param string $filename The filename to use for HTTP headers
     * @access public
     */
-    public function send($filename)
+    function send($filename)
     {
-        header('Content-type: application/vnd.ms-excel');
-        header('Content-Disposition: attachment; filename="' . $filename .'"');
-        header('Expires: 0');
-        header('Cache-Control: must-revalidate, post-check=0,pre-check=0');
-        header('Pragma: public');
+        header("Content-type: application/vnd.ms-excel");
+        header("Content-Disposition: attachment; filename=\"$filename\"");
+        header("Expires: 0");
+        header("Cache-Control: must-revalidate, post-check=0,pre-check=0");
+        header("Pragma: public");
     }
 
     /**
@@ -76,26 +78,27 @@ class Spreadsheet_Excel_Writer extends Spreadsheet_Excel_Writer_Workbook
     * @access public
     * @static
     * @param integer $row Row for the cell to convert (0-indexed).
-    * @param integer $column Column for the cell to convert (0-indexed).
+    * @param integer $col Column for the cell to convert (0-indexed).
     * @return string The cell identifier in A1 format
     */
-    public function rowcolToCell($row, $column)
+    function rowcolToCell($row, $col)
     {
-        if ($column > 255) { //maximum column value exceeded
-            return new PEAR_Error('Maximum column value exceeded: ' . $column);
+        if ($col > 255) { //maximum column value exceeded
+            return new PEAR_Error("Maximum column value exceeded: $col");
         }
 
-        $int    = (int)($column / 26);
-        $frac   = $column % 26;
-        $chr1   = '';
+        $int = (int)($col / 26);
+        $frac = $col % 26;
+        $chr1 = '';
 
         if ($int > 0) {
             $chr1 = chr(ord('A') + $int - 1);
         }
 
         $chr2 = chr(ord('A') + $frac);
-        ++$row;
+        $row++;
 
         return $chr1 . $chr2 . $row;
     }
 }
+?>
diff --git a/Spreadsheet/Excel/Writer/BIFFwriter.php b/Spreadsheet/Excel/Writer/BIFFwriter.php
index bf89344..c949b45 100644
--- a/Spreadsheet/Excel/Writer/BIFFwriter.php
+++ b/Spreadsheet/Excel/Writer/BIFFwriter.php
@@ -32,6 +32,8 @@
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
+require_once 'PEAR.php';
+
 /**
 * Class for writing Excel BIFF records.
 *
@@ -55,59 +57,59 @@ class Spreadsheet_Excel_Writer_BIFFwriter extends PEAR
     * The BIFF/Excel version (5).
     * @var integer
     */
-    public $BIFF_version = 0x0500;
+    var $_BIFF_version = 0x0500;
 
     /**
     * The byte order of this architecture. 0 => little endian, 1 => big endian
     * @var integer
     */
-    public $byteOrder;
+    var $_byte_order;
 
     /**
     * The string containing the data of the BIFF stream
     * @var string
     */
-    public $data;
+    var $_data;
 
     /**
-    * The size of the data in bytes. Should be the same as strlen($this->data)
+    * The size of the data in bytes. Should be the same as strlen($this->_data)
     * @var integer
     */
-    public $dataSize;
+    var $_datasize;
 
     /**
-    * The maximun length for a BIFF record. See addContinue()
+    * The maximun length for a BIFF record. See _addContinue()
     * @var integer
-    * @see addContinue()
+    * @see _addContinue()
     */
-    public $limit;
+    var $_limit;
 
     /**
     * The temporary dir for storing the OLE file
     * @var string
     */
-    public $temporaryDirectory;
+    var $_tmp_dir;
 
     /**
     * The temporary file for storing the OLE file
     * @var string
     */
-    public $temporaryFile;
+    var $_tmp_file;
 
     /**
     * Constructor
     *
     * @access public
     */
-    public function __construct()
+    function Spreadsheet_Excel_Writer_BIFFwriter()
     {
-        $this->byteOrder            = '';
-        $this->data                 = '';
-        $this->dataSize             = 0;
-        $this->limit                = 2080;
-        $this->temporaryDirectory   = '';
+        $this->_byte_order = '';
+        $this->_data       = '';
+        $this->_datasize   = 0;
+        $this->_limit      = 2080;
+        $this->_tmp_dir    = '';
         // Set the byte order
-        $this->setByteOrder();
+        $this->_setByteOrder();
     }
 
     /**
@@ -116,23 +118,21 @@ class Spreadsheet_Excel_Writer_BIFFwriter extends PEAR
     *
     * @access private
     */
-    protected function setByteOrder()
+    function _setByteOrder()
     {
         // Check if "pack" gives the required IEEE 64bit float
-        $testString = pack('d', 1.2345);
-        $number     = pack('C8', 0x8D, 0x97, 0x6E, 0x12, 0x83, 0xC0, 0xF3, 0x3F);
-
-        if ($number == $testString) {
+        $teststr = pack("d", 1.2345);
+        $number  = pack("C8", 0x8D, 0x97, 0x6E, 0x12, 0x83, 0xC0, 0xF3, 0x3F);
+        if ($number == $teststr) {
             $byte_order = 0;    // Little Endian
-        } elseif ($number == strrev($testString)){
+        } elseif ($number == strrev($teststr)){
             $byte_order = 1;    // Big Endian
         } else {
             // Give up. I'll fix this in a later version.
-            return $this->raiseError('Required floating point format ' .
-                                     'not supported on this platform.');
+            return $this->raiseError("Required floating point format ".
+                                     "not supported on this platform.");
         }
-
-        $this->byteOrder = $byte_order;
+        $this->_byte_order = $byte_order;
     }
 
     /**
@@ -141,14 +141,13 @@ class Spreadsheet_Excel_Writer_BIFFwriter extends PEAR
     * @param string $data binary data to prepend
     * @access private
     */
-    protected function prepend($data)
+    function _prepend($data)
     {
-        if (strlen($data) > $this->limit) {
-            $data = $this->addContinue($data);
+        if (strlen($data) > $this->_limit) {
+            $data = $this->_addContinue($data);
         }
-
-        $this->data      = $data . $this->data;
-        $this->dataSize += strlen($data);
+        $this->_data      = $data.$this->_data;
+        $this->_datasize += strlen($data);
     }
 
     /**
@@ -157,14 +156,13 @@ class Spreadsheet_Excel_Writer_BIFFwriter extends PEAR
     * @param string $data binary data to append
     * @access private
     */
-    protected function append($data)
+    function _append($data)
     {
-        if (strlen($data) > $this->limit) {
-            $data = $this->addContinue($data);
+        if (strlen($data) > $this->_limit) {
+            $data = $this->_addContinue($data);
         }
-
-        $this->data      = $this->data . $data;
-        $this->dataSize += strlen($data);
+        $this->_data      = $this->_data.$data;
+        $this->_datasize += strlen($data);
     }
 
     /**
@@ -175,28 +173,28 @@ class Spreadsheet_Excel_Writer_BIFFwriter extends PEAR
     *                       0x0010 Worksheet.
     * @access private
     */
-    protected function storeBof($type)
+    function _storeBof($type)
     {
         $record  = 0x0809;        // Record identifier
 
         // According to the SDK $build and $year should be set to zero.
         // However, this throws a warning in Excel 5. So, use magic numbers.
-        if ($this->BIFF_version == 0x0500) {
+        if ($this->_BIFF_version == 0x0500) {
             $length  = 0x0008;
             $unknown = '';
             $build   = 0x096C;
             $year    = 0x07C9;
-        } elseif ($this->BIFF_version == 0x0600) {
+        } elseif ($this->_BIFF_version == 0x0600) {
             $length  = 0x0010;
             $unknown = pack("VV", 0x00000041, 0x00000006); //unknown last 8 bytes for BIFF8
             $build   = 0x0DBB;
             $year    = 0x07CC;
         }
-        $version = $this->BIFF_version;
+        $version = $this->_BIFF_version;
 
-        $header  = pack('vv',   $record, $length);
-        $data    = pack('vvvv', $version, $type, $build, $year);
-        $this->prepend($header . $data . $unknown);
+        $header  = pack("vv",   $record, $length);
+        $data    = pack("vvvv", $version, $type, $build, $year);
+        $this->_prepend($header . $data . $unknown);
     }
 
     /**
@@ -204,12 +202,12 @@ class Spreadsheet_Excel_Writer_BIFFwriter extends PEAR
     *
     * @access private
     */
-    protected function storeEof()
+    function _storeEof()
     {
         $record    = 0x000A;   // Record identifier
         $length    = 0x0000;   // Number of bytes to follow
-        $header    = pack('vv', $record, $length);
-        $this->append($header);
+        $header    = pack("vv", $record, $length);
+        $this->_append($header);
     }
 
     /**
@@ -224,16 +222,16 @@ class Spreadsheet_Excel_Writer_BIFFwriter extends PEAR
     * @return string        A very convenient string of continue blocks
     * @access private
     */
-    protected function addContinue($data)
+    function _addContinue($data)
     {
-        $limit  = $this->limit;
+        $limit  = $this->_limit;
         $record = 0x003C;         // Record identifier
 
         // The first 2080/8224 bytes remain intact. However, we have to change
         // the length field of the record.
-        $tmp = substr($data, 0, 2).pack('v', $limit-4) . substr($data, 4, $limit - 4);
+        $tmp = substr($data, 0, 2).pack("v", $limit-4).substr($data, 4, $limit - 4);
 
-        $header = pack('vv', $record, $limit);  // Headers for continue records
+        $header = pack("vv", $record, $limit);  // Headers for continue records
 
         // Retrieve chunks of 2080/8224 bytes +4 for the header.
         $data_length = strlen($data);
@@ -243,7 +241,7 @@ class Spreadsheet_Excel_Writer_BIFFwriter extends PEAR
         }
 
         // Retrieve the last chunk of data
-        $header  = pack('vv', $record, strlen($data) - $i);
+        $header  = pack("vv", $record, strlen($data) - $i);
         $tmp    .= $header;
         $tmp    .= substr($data, $i, strlen($data) - $i);
 
@@ -257,13 +255,13 @@ class Spreadsheet_Excel_Writer_BIFFwriter extends PEAR
     * @param string $dir The dir to be used as temp dir
     * @return true if given dir is valid, false otherwise
     */
-    protected function setTempDir($dir)
+    function setTempDir($dir)
     {
         if (is_dir($dir)) {
-            $this->temporaryDirectory = $dir;
+            $this->_tmp_dir = $dir;
             return true;
         }
-
         return false;
     }
 }
+?>
diff --git a/Spreadsheet/Excel/Writer/Format.php b/Spreadsheet/Excel/Writer/Format.php
index 7841471..8922360 100644
--- a/Spreadsheet/Excel/Writer/Format.php
+++ b/Spreadsheet/Excel/Writer/Format.php
@@ -32,6 +32,8 @@
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
+require_once 'PEAR.php';
+
 /**
 * Class for generating Excel XF records (formats)
 *
@@ -42,219 +44,212 @@
 
 class Spreadsheet_Excel_Writer_Format extends PEAR
 {
-    /**
-     * The BIFF version for the workbook
-     * @var integer
-     */
-    public $_BIFF_version;
-
-    /**
-     * Index to the FONT record.
-     * @var integer
-     */
-    public $font_index;
-
     /**
     * The index given by the workbook when creating a new format.
     * @var integer
     */
-    public $_xf_index;
+    var $_xf_index;
+
+    /**
+    * Index to the FONT record.
+    * @var integer
+    */
+    var $font_index;
 
     /**
     * The font name (ASCII).
     * @var string
     */
-    public $_font_name;
+    var $_font_name;
 
     /**
     * Height of font (1/20 of a point)
     * @var integer
     */
-    public $_size;
+    var $_size;
 
     /**
     * Bold style
     * @var integer
     */
-    public $_bold;
+    var $_bold;
 
     /**
     * Bit specifiying if the font is italic.
     * @var integer
     */
-    public $_italic;
+    var $_italic;
 
     /**
     * Index to the cell's color
     * @var integer
     */
-    public $_color;
+    var $_color;
 
     /**
     * The text underline property
     * @var integer
     */
-    public $_underline;
+    var $_underline;
 
     /**
     * Bit specifiying if the font has strikeout.
     * @var integer
     */
-    public $_font_strikeout;
+    var $_font_strikeout;
 
     /**
     * Bit specifiying if the font has outline.
     * @var integer
     */
-    public $_font_outline;
+    var $_font_outline;
 
     /**
     * Bit specifiying if the font has shadow.
     * @var integer
     */
-    public $_font_shadow;
+    var $_font_shadow;
 
     /**
     * 2 bytes specifiying the script type for the font.
     * @var integer
     */
-    public $_font_script;
+    var $_font_script;
 
     /**
     * Byte specifiying the font family.
     * @var integer
     */
-    public $_font_family;
+    var $_font_family;
 
     /**
     * Byte specifiying the font charset.
     * @var integer
     */
-    public $_font_charset;
+    var $_font_charset;
 
     /**
     * An index (2 bytes) to a FORMAT record (number format).
     * @var integer
     */
-    public $_num_format;
+    var $_num_format;
 
     /**
     * Bit specifying if formulas are hidden.
     * @var integer
     */
-    public $_hidden;
+    var $_hidden;
 
     /**
     * Bit specifying if the cell is locked.
     * @var integer
     */
-    public $_locked;
+    var $_locked;
 
     /**
     * The three bits specifying the text horizontal alignment.
     * @var integer
     */
-    public $_text_h_align;
+    var $_text_h_align;
 
     /**
     * Bit specifying if the text is wrapped at the right border.
     * @var integer
     */
-    public $_text_wrap;
+    var $_text_wrap;
 
     /**
     * The three bits specifying the text vertical alignment.
     * @var integer
     */
-    public $_text_v_align;
+    var $_text_v_align;
 
     /**
     * 1 bit, apparently not used.
     * @var integer
     */
-    public $_text_justlast;
+    var $_text_justlast;
 
     /**
     * The two bits specifying the text rotation.
     * @var integer
     */
-    public $_rotation;
+    var $_rotation;
 
     /**
     * The cell's foreground color.
     * @var integer
     */
-    public $_fg_color;
+    var $_fg_color;
 
     /**
     * The cell's background color.
     * @var integer
     */
-    public $_bg_color;
+    var $_bg_color;
 
     /**
     * The cell's background fill pattern.
     * @var integer
     */
-    public $_pattern;
+    var $_pattern;
 
     /**
     * Style of the bottom border of the cell
     * @var integer
     */
-    public $_bottom;
+    var $_bottom;
 
     /**
     * Color of the bottom border of the cell.
     * @var integer
     */
-    public $_bottom_color;
+    var $_bottom_color;
 
     /**
     * Style of the top border of the cell
     * @var integer
     */
-    public $_top;
+    var $_top;
 
     /**
     * Color of the top border of the cell.
     * @var integer
     */
-    public $_top_color;
+    var $_top_color;
 
     /**
     * Style of the left border of the cell
     * @var integer
     */
-    public $_left;
+    var $_left;
 
     /**
     * Color of the left border of the cell.
     * @var integer
     */
-    public $_left_color;
+    var $_left_color;
 
     /**
     * Style of the right border of the cell
     * @var integer
     */
-    public $_right;
+    var $_right;
 
     /**
     * Color of the right border of the cell.
     * @var integer
     */
-    public $_right_color;
+    var $_right_color;
 
     /**
     * Constructor
     *
     * @access private
-    * @param integer $BIFF_version
     * @param integer $index the XF index for the format.
     * @param array   $properties array with properties to be set on initialization.
     */
-    public function __construct($BIFF_version, $index = 0, $properties =  array())
+    function Spreadsheet_Excel_Writer_Format($BIFF_version, $index = 0, $properties =  array())
     {
         $this->_xf_index       = $index;
         $this->_BIFF_version   = $BIFF_version;
@@ -317,7 +312,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @param string $style The type of the XF record ('style' or 'cell').
     * @return string The XF record
     */
-    public function getXf($style)
+    function getXf($style)
     {
         // Set the type of the XF record and some of the attributes.
         if ($style == 'style') {
@@ -449,7 +444,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     *
     * @return string The FONT record
     */
-    public function getFont()
+    function getFont()
     {
         $dyHeight   = $this->_size * 20;    // Height of font (1/20 of a point)
         $icv        = $this->_color;        // Index to color palette
@@ -497,7 +492,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
 
     /**
     * Returns a unique hash key for a font.
-    * Used by Spreadsheet_Excel_Writer_Workbook::storeAllFonts()
+    * Used by Spreadsheet_Excel_Writer_Workbook::_storeAllFonts()
     *
     * The elements that form the key are arranged to increase the probability of
     * generating a unique key. Elements that hold a large range of numbers
@@ -505,7 +500,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     *
     * @return string A key for this font
     */
-    public function getFontKey()
+    function getFontKey()
     {
         $key  = "$this->_font_name$this->_size";
         $key .= "$this->_font_script$this->_underline";
@@ -521,7 +516,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     *
     * @return integer The index for the XF record
     */
-    public function getXfIndex()
+    function getXfIndex()
     {
         return($this->_xf_index);
     }
@@ -535,7 +530,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @param string $name_color name of the color (i.e.: 'blue', 'red', etc..). Optional.
     * @return integer The color index
     */
-    protected function _getColor($name_color = '')
+    function _getColor($name_color = '')
     {
         $colors = array(
                           'aqua'    => 0x07,
@@ -588,7 +583,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param string $location alignment for the cell ('left', 'right', etc...).
     */
-    public function setAlign($location)
+    function setAlign($location)
     {
         if (preg_match("/\d/",$location)) {
             return;                      // Ignore numbers
@@ -646,7 +641,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param string $location alignment for the cell ('left', 'right', etc...).
     */
-    public function setHAlign($location)
+    function setHAlign($location)
     {
         if (preg_match("/\d/",$location)) {
             return;                      // Ignore numbers
@@ -686,7 +681,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param string $location alignment for the cell ('top', 'vleft', 'vright', etc...).
     */
-    public function setVAlign($location)
+    function setVAlign($location)
     {
         if (preg_match("/\d/",$location)) {
             return;                      // Ignore numbers
@@ -719,7 +714,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     *
     * @access public
     */
-    public function setMerge()
+    function setMerge()
     {
         $this->setAlign('merge');
     }
@@ -734,7 +729,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
                              1 maps to 700 (bold text). Valid range is: 100-1000.
                              It's Optional, default is 1 (bold).
     */
-    public function setBold($weight = 1)
+    function setBold($weight = 1)
     {
         if ($weight == 1) {
             $weight = 0x2BC;  // Bold text
@@ -762,7 +757,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param integer $style style of the cell border. 1 => thin, 2 => thick.
     */
-    public function setBottom($style)
+    function setBottom($style)
     {
         $this->_bottom = $style;
     }
@@ -773,7 +768,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param integer $style style of the cell top border. 1 => thin, 2 => thick.
     */
-    public function setTop($style)
+    function setTop($style)
     {
         $this->_top = $style;
     }
@@ -784,7 +779,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param integer $style style of the cell left border. 1 => thin, 2 => thick.
     */
-    public function setLeft($style)
+    function setLeft($style)
     {
         $this->_left = $style;
     }
@@ -795,7 +790,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param integer $style style of the cell right border. 1 => thin, 2 => thick.
     */
-    public function setRight($style)
+    function setRight($style)
     {
         $this->_right = $style;
     }
@@ -807,7 +802,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param integer $style style to apply for all cell borders. 1 => thin, 2 => thick.
     */
-    public function setBorder($style)
+    function setBorder($style)
     {
         $this->setBottom($style);
         $this->setTop($style);
@@ -827,7 +822,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @param mixed $color The color we are setting. Either a string (like 'blue'),
     *                     or an integer (range is [8...63]).
     */
-    public function setBorderColor($color)
+    function setBorderColor($color)
     {
         $this->setBottomColor($color);
         $this->setTopColor($color);
@@ -841,7 +836,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param mixed $color either a string (like 'blue'), or an integer (range is [8...63]).
     */
-    public function setBottomColor($color)
+    function setBottomColor($color)
     {
         $value = $this->_getColor($color);
         $this->_bottom_color = $value;
@@ -853,7 +848,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param mixed $color either a string (like 'blue'), or an integer (range is [8...63]).
     */
-    public function setTopColor($color)
+    function setTopColor($color)
     {
         $value = $this->_getColor($color);
         $this->_top_color = $value;
@@ -865,7 +860,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param mixed $color either a string (like 'blue'), or an integer (range is [8...63]).
     */
-    public function setLeftColor($color)
+    function setLeftColor($color)
     {
         $value = $this->_getColor($color);
         $this->_left_color = $value;
@@ -877,7 +872,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param mixed $color either a string (like 'blue'), or an integer (range is [8...63]).
     */
-    public function setRightColor($color)
+    function setRightColor($color)
     {
         $value = $this->_getColor($color);
         $this->_right_color = $value;
@@ -890,7 +885,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param mixed $color either a string (like 'blue'), or an integer (range is [8...63]).
     */
-    public function setFgColor($color)
+    function setFgColor($color)
     {
         $value = $this->_getColor($color);
         $this->_fg_color = $value;
@@ -905,7 +900,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param mixed $color either a string (like 'blue'), or an integer (range is [8...63]).
     */
-    public function setBgColor($color)
+    function setBgColor($color)
     {
         $value = $this->_getColor($color);
         $this->_bg_color = $value;
@@ -920,7 +915,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param mixed $color either a string (like 'blue'), or an integer (range is [8...63]).
     */
-    public function setColor($color)
+    function setColor($color)
     {
         $value = $this->_getColor($color);
         $this->_color = $value;
@@ -933,7 +928,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @param integer $arg Optional. Defaults to 1. Meaningful values are: 0-18,
     *                     0 meaning no background.
     */
-    public function setPattern($arg = 1)
+    function setPattern($arg = 1)
     {
         $this->_pattern = $arg;
     }
@@ -945,7 +940,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @param integer $underline The value for underline. Possible values are:
     *                          1 => underline, 2 => double underline.
     */
-    public function setUnderline($underline)
+    function setUnderline($underline)
     {
         $this->_underline = $underline;
     }
@@ -955,7 +950,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     *
     * @access public
     */
-    public function setItalic()
+    function setItalic()
     {
         $this->_italic = 1;
     }
@@ -966,7 +961,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param integer $size The font size (in pixels I think).
     */
-    public function setSize($size)
+    function setSize($size)
     {
         $this->_size = $size;
     }
@@ -976,7 +971,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     *
     * @access public
     */
-    public function setTextWrap()
+    function setTextWrap()
     {
         $this->_text_wrap = 1;
     }
@@ -988,7 +983,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @param integer $angle The rotation angle for the text (clockwise). Possible
                             values are: 0, 90, 270 and -1 for stacking top-to-bottom.
     */
-    public function setTextRotation($angle)
+    function setTextRotation($angle)
     {
         switch ($angle)
         {
@@ -1032,7 +1027,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @access public
     * @param integer $num_format The numeric format.
     */
-    public function setNumFormat($num_format)
+    function setNumFormat($num_format)
     {
         $this->_num_format = $num_format;
     }
@@ -1042,7 +1037,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     *
     * @access public
     */
-    public function setStrikeOut()
+    function setStrikeOut()
     {
         $this->_font_strikeout = 1;
     }
@@ -1052,7 +1047,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     *
     * @access public
     */
-    public function setOutLine()
+    function setOutLine()
     {
         $this->_font_outline = 1;
     }
@@ -1062,7 +1057,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     *
     * @access public
     */
-    public function setShadow()
+    function setShadow()
     {
         $this->_font_shadow = 1;
     }
@@ -1074,7 +1069,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @param integer $script The value for script type. Possible values are:
     *                        1 => superscript, 2 => subscript.
     */
-    public function setScript($script)
+    function setScript($script)
     {
         $this->_font_script = $script;
     }
@@ -1084,7 +1079,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
      *
      * @access public
      */
-     public function setLocked()
+     function setLocked()
      {
          $this->_locked = 1;
      }
@@ -1094,7 +1089,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     *
     * @access public
     */
-    public function setUnLocked()
+    function setUnLocked()
     {
         $this->_locked = 0;
     }
@@ -1103,10 +1098,10 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * Sets the font family name.
     *
     * @access public
-    * @param string $font_family The font family name. Possible values are:
+    * @param string $fontfamily The font family name. Possible values are:
     *                           'Times New Roman', 'Arial', 'Courier'.
     */
-    public function setFontFamily($font_family)
+    function setFontFamily($font_family)
     {
         $this->_font_name = $font_family;
     }
diff --git a/Spreadsheet/Excel/Writer/Parser.php b/Spreadsheet/Excel/Writer/Parser.php
index 3b1eda1..bd93824 100644
--- a/Spreadsheet/Excel/Writer/Parser.php
+++ b/Spreadsheet/Excel/Writer/Parser.php
@@ -25,77 +25,79 @@
 /**
 * @const SPREADSHEET_EXCEL_WRITER_ADD token identifier for character "+"
 */
-define('SPREADSHEET_EXCEL_WRITER_ADD', '+');
+define('SPREADSHEET_EXCEL_WRITER_ADD', "+");
 
 /**
 * @const SPREADSHEET_EXCEL_WRITER_SUB token identifier for character "-"
 */
-define('SPREADSHEET_EXCEL_WRITER_SUB', '-');
+define('SPREADSHEET_EXCEL_WRITER_SUB', "-");
 
 /**
 * @const SPREADSHEET_EXCEL_WRITER_MUL token identifier for character "*"
 */
-define('SPREADSHEET_EXCEL_WRITER_MUL', '*');
+define('SPREADSHEET_EXCEL_WRITER_MUL', "*");
 
 /**
 * @const SPREADSHEET_EXCEL_WRITER_DIV token identifier for character "/"
 */
-define('SPREADSHEET_EXCEL_WRITER_DIV', '/');
+define('SPREADSHEET_EXCEL_WRITER_DIV', "/");
 
 /**
 * @const SPREADSHEET_EXCEL_WRITER_OPEN token identifier for character "("
 */
-define('SPREADSHEET_EXCEL_WRITER_OPEN', '(');
+define('SPREADSHEET_EXCEL_WRITER_OPEN', "(");
 
 /**
 * @const SPREADSHEET_EXCEL_WRITER_CLOSE token identifier for character ")"
 */
-define('SPREADSHEET_EXCEL_WRITER_CLOSE', ')');
+define('SPREADSHEET_EXCEL_WRITER_CLOSE', ")");
 
 /**
 * @const SPREADSHEET_EXCEL_WRITER_COMA token identifier for character ","
 */
-define('SPREADSHEET_EXCEL_WRITER_COMA', ',');
+define('SPREADSHEET_EXCEL_WRITER_COMA', ",");
 
 /**
 * @const SPREADSHEET_EXCEL_WRITER_SEMICOLON token identifier for character ";"
 */
-define('SPREADSHEET_EXCEL_WRITER_SEMICOLON', ';');
+define('SPREADSHEET_EXCEL_WRITER_SEMICOLON', ";");
 
 /**
 * @const SPREADSHEET_EXCEL_WRITER_GT token identifier for character ">"
 */
-define('SPREADSHEET_EXCEL_WRITER_GT', '>');
+define('SPREADSHEET_EXCEL_WRITER_GT', ">");
 
 /**
 * @const SPREADSHEET_EXCEL_WRITER_LT token identifier for character "<"
 */
-define('SPREADSHEET_EXCEL_WRITER_LT', '<');
+define('SPREADSHEET_EXCEL_WRITER_LT', "<");
 
 /**
 * @const SPREADSHEET_EXCEL_WRITER_LE token identifier for character "<="
 */
-define('SPREADSHEET_EXCEL_WRITER_LE', '<=');
+define('SPREADSHEET_EXCEL_WRITER_LE', "<=");
 
 /**
 * @const SPREADSHEET_EXCEL_WRITER_GE token identifier for character ">="
 */
-define('SPREADSHEET_EXCEL_WRITER_GE', '>=');
+define('SPREADSHEET_EXCEL_WRITER_GE', ">=");
 
 /**
 * @const SPREADSHEET_EXCEL_WRITER_EQ token identifier for character "="
 */
-define('SPREADSHEET_EXCEL_WRITER_EQ', '=');
+define('SPREADSHEET_EXCEL_WRITER_EQ', "=");
 
 /**
 * @const SPREADSHEET_EXCEL_WRITER_NE token identifier for character "<>"
 */
-define('SPREADSHEET_EXCEL_WRITER_NE', '<>');
+define('SPREADSHEET_EXCEL_WRITER_NE', "<>");
 
 /**
 * * @const SPREADSHEET_EXCEL_WRITER_CONCAT token identifier for character "&"
 */
-define('SPREADSHEET_EXCEL_WRITER_CONCAT', '&');
+define('SPREADSHEET_EXCEL_WRITER_CONCAT', "&");
+
+require_once 'PEAR.php';
 
 /**
 * Class for parsing Excel formulas
@@ -107,73 +109,67 @@ define('SPREADSHEET_EXCEL_WRITER_CONCAT', '&');
 
 class Spreadsheet_Excel_Writer_Parser extends PEAR
 {
-    /**
-     * The BIFF version for the workbook
-     * @var integer
-     */
-    public $_BIFF_version;
-
     /**
     * The index of the character we are currently looking at
     * @var integer
     */
-    public $_current_char;
+    var $_current_char;
 
     /**
     * The token we are working on.
     * @var string
     */
-    public $_current_token;
+    var $_current_token;
 
     /**
     * The formula to parse
     * @var string
     */
-    public $_formula;
-
-    /**
-    * @var array
-    */
-    public $_functions;
+    var $_formula;
 
     /**
     * The character ahead of the current char
     * @var string
     */
-    public $_lookahead;
+    var $_lookahead;
 
     /**
     * The parse tree to be generated
     * @var string
     */
-    public $_parse_tree;
+    var $_parse_tree;
 
     /**
     * The byte order. 1 => big endian, 0 => little endian.
     * @var integer
     */
-    public $_byte_order;
+    var $_byte_order;
 
     /**
     * Array of external sheets
     * @var array
     */
-    public $_ext_sheets;
+    var $_ext_sheets;
 
     /**
     * Array of sheet references in the form of REF structures
     * @var array
     */
-    public $_references;
+    var $_references;
+
+    /**
+    * The BIFF version for the workbook
+    * @var integer
+    */
+    var $_BIFF_version;
 
     /**
     * The class constructor
     *
     * @param integer $byte_order The byte order (Little endian or Big endian) of the architecture
-    *                            (optional). 1 => big endian, 0 (default) little endian.
-    * @param integer $biff_version
+                                 (optional). 1 => big endian, 0 (default) little endian.
     */
-    public function __construct($byte_order, $biff_version)
+    function Spreadsheet_Excel_Writer_Parser($byte_order, $biff_version)
     {
         $this->_current_char  = 0;
         $this->_BIFF_version  = $biff_version;
@@ -192,7 +188,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     *
     * @access private
     */
-    protected function _initializeHashes()
+    function _initializeHashes()
     {
         // The Excel ptg indices
         $this->ptg = array(
@@ -544,7 +540,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @return mixed the converted token on success. PEAR_Error if the token
     *               is not recognized
     */
-    protected function _convert($token)
+    function _convert($token)
     {
         if (preg_match("/^\"[^\"]{0,255}\"$/", $token)) {
             return $this->_convertString($token);
@@ -603,9 +599,8 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     *
     * @access private
     * @param mixed $num an integer or double for conversion to its ptg value
-    * @return string
     */
-    protected function _convertNumber($num)
+    function _convertNumber($num)
     {
         // Integer in the range 0..2**16-1
         if ((preg_match("/^\d+$/", $num)) and ($num <= 65535)) {
@@ -626,7 +621,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @return mixed the converted token on success. PEAR_Error if the string
     *               is longer than 255 characters.
     */
-    protected function _convertString($string)
+    function _convertString($string)
     {
         // chop away beggining and ending quotes
         $string = substr($string, 1, strlen($string) - 2);
@@ -651,7 +646,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @param integer $num_args The number of arguments the function receives.
     * @return string The packed ptg for the function
     */
-    protected function _convertFunction($token, $num_args)
+    function _convertFunction($token, $num_args)
     {
         $args     = $this->_functions[$token][1];
         $volatile = $this->_functions[$token][3];
@@ -667,14 +662,12 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     }
 
     /**
-     * Convert an Excel range such as A1:D4 to a ptgRefV.
-     *
-     * @access private
-     * @param string $range An Excel range in the A1:A2 or A1..A2 format.
-     * @param int $class
-     * @return array|string
-     */
-    protected function _convertRange2d($range, $class=0)
+    * Convert an Excel range such as A1:D4 to a ptgRefV.
+    *
+    * @access private
+    * @param string $range An Excel range in the A1:A2 or A1..A2 format.
+    */
+    function _convertRange2d($range, $class=0)
     {
 
         // TODO: possible class value 0,1,2 check Formula.pm
@@ -723,7 +716,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @param string $token An Excel range in the Sheet1!A1:A2 format.
     * @return mixed The packed ptgArea3d token on success, PEAR_Error on failure.
     */
-    protected function _convertRange3d($token)
+    function _convertRange3d($token)
     {
         $class = 2; // as far as I know, this is magick.
 
@@ -787,7 +780,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @param string $cell An Excel cell reference
     * @return string The cell in packed() format with the corresponding ptg
     */
-    protected function _convertRef2d($cell)
+    function _convertRef2d($cell)
     {
         $class = 2; // as far as I know, this is magick.
 
@@ -820,7 +813,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @param string $cell An Excel cell reference
     * @return mixed The packed ptgRef3d token on success, PEAR_Error on failure.
     */
-    protected function _convertRef3d($cell)
+    function _convertRef3d($cell)
     {
         $class = 2; // as far as I know, this is magick.
 
@@ -865,7 +858,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @param string $ext_ref The name of the external reference
     * @return string The reference index in packed() format
     */
-    protected function _packExtRef($ext_ref)
+    function _packExtRef($ext_ref)
     {
         $ext_ref = preg_replace("/^'/", '', $ext_ref); // Remove leading  ' if any.
         $ext_ref = preg_replace("/'$/", '', $ext_ref); // Remove trailing ' if any.
@@ -911,7 +904,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @return mixed The reference index in packed() format on success,
     *               PEAR_Error on failure
     */
-    protected function _getRefIndex($ext_ref)
+    function _getRefIndex($ext_ref)
     {
         $ext_ref = preg_replace("/^'/", '', $ext_ref); // Remove leading  ' if any.
         $ext_ref = preg_replace("/'$/", '', $ext_ref); // Remove trailing ' if any.
@@ -969,7 +962,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @access private
     * @return integer The sheet index, -1 if the sheet was not found
     */
-    protected function _getSheetIndex($sheet_name)
+    function _getSheetIndex($sheet_name)
     {
         if (!isset($this->_ext_sheets[$sheet_name])) {
             return -1;
@@ -988,7 +981,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @param string  $name  The name of the worksheet being added
     * @param integer $index The index of the worksheet being added
     */
-    public function setExtSheet($name, $index)
+    function setExtSheet($name, $index)
     {
         $this->_ext_sheets[$name] = $index;
     }
@@ -1000,7 +993,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @param string $cell The Excel cell reference to be packed
     * @return array Array containing the row and column in packed() format
     */
-    protected function _cellToPackedRowcol($cell)
+    function _cellToPackedRowcol($cell)
     {
         $cell = strtoupper($cell);
         list($row, $col, $row_rel, $col_rel) = $this->_cellToRowcol($cell);
@@ -1035,7 +1028,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @param string $range The Excel range to be packed
     * @return array Array containing (row1,col1,row2,col2) in packed() format
     */
-    protected function _rangeToPackedRange($range)
+    function _rangeToPackedRange($range)
     {
         preg_match('/(\$)?(\d+)\:(\$)?(\d+)/', $range, $match);
         // return absolute rows if there is a $ in the ref
@@ -1082,7 +1075,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @param string $cell The Excel cell reference in A1 format.
     * @return array
     */
-    protected function _cellToRowcol($cell)
+    function _cellToRowcol($cell)
     {
         preg_match('/(\$)?([A-I]?[A-Z])(\$)?(\d+)/',$cell,$match);
         // return absolute column if there is a $ in the ref
@@ -1112,7 +1105,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     *
     * @access private
     */
-    protected function _advance()
+    function _advance()
     {
         $i = $this->_current_char;
         $formula_length = strlen($this->_formula);
@@ -1162,7 +1155,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @param mixed $token The token to check.
     * @return mixed       The checked token or false on failure
     */
-    protected function _match($token)
+    function _match($token)
     {
         switch($token) {
             case SPREADSHEET_EXCEL_WRITER_ADD:
@@ -1293,7 +1286,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     *                        sign (=).
     * @return mixed true on success, PEAR_Error on failure
     */
-    public function parse($formula)
+    function parse($formula)
     {
         $this->_current_char = 0;
         $this->_formula      = $formula;
@@ -1313,7 +1306,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @access private
     * @return mixed The parsed ptg'd tree on success, PEAR_Error on failure
     */
-    protected function _condition()
+    function _condition()
     {
         $result = $this->_expression();
         if (PEAR::isError($result)) {
@@ -1381,7 +1374,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @access private
     * @return mixed The parsed ptg'd tree on success, PEAR_Error on failure
     */
-    protected function _expression()
+    function _expression()
     {
         // If it's a string return a string node
         if (preg_match("/^\"[^\"]{0,255}\"$/", $this->_current_token)) {
@@ -1429,7 +1422,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @see _fact()
     * @return array The parsed ptg'd tree
     */
-    protected function _parenthesizedExpression()
+    function _parenthesizedExpression()
     {
         $result = $this->_createTree('ptgParen', $this->_expression(), '');
         return $result;
@@ -1442,7 +1435,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @access private
     * @return mixed The parsed ptg'd tree on success, PEAR_Error on failure
     */
-    protected function _term()
+    function _term()
     {
         $result = $this->_fact();
         if (PEAR::isError($result)) {
@@ -1481,7 +1474,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @access private
     * @return mixed The parsed ptg'd tree on success, PEAR_Error on failure
     */
-    protected function _fact()
+    function _fact()
     {
         if ($this->_current_token == SPREADSHEET_EXCEL_WRITER_OPEN) {
             $this->_advance();         // eat the "("
@@ -1559,7 +1552,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @access private
     * @return mixed The parsed ptg'd tree on success, PEAR_Error on failure
     */
-    protected function _func()
+    function _func()
     {
         $num_args = 0; // number of arguments received
         $function = strtoupper($this->_current_token);
@@ -1615,7 +1608,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @param mixed $right The right array (sub-tree) or a final node.
     * @return array A tree
     */
-    protected function _createTree($value, $left, $right)
+    function _createTree($value, $left, $right)
     {
         return array('value' => $value, 'left' => $left, 'right' => $right);
     }
@@ -1647,7 +1640,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @param array $tree The optional tree to convert.
     * @return string The tree in reverse polish notation
     */
-    public function toReversePolish($tree = array())
+    function toReversePolish($tree = array())
     {
         $polish = ""; // the string we are going to return
         if (empty($tree)) { // If it's the first call use _parse_tree
diff --git a/Spreadsheet/Excel/Writer/Validator.php b/Spreadsheet/Excel/Writer/Validator.php
index 6f97368..0f091c6 100644
--- a/Spreadsheet/Excel/Writer/Validator.php
+++ b/Spreadsheet/Excel/Writer/Validator.php
@@ -22,19 +22,21 @@
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
+//require_once('PEAR.php');
+
 // Possible operator types
 
 /*
 FIXME: change prefixes
 */
-define('OP_BETWEEN',    0x00);
-define('OP_NOTBETWEEN', 0x01);
-define('OP_EQUAL',      0x02);
-define('OP_NOTEQUAL',   0x03);
-define('OP_GT',         0x04);
-define('OP_LT',         0x05);
-define('OP_GTE',        0x06);
-define('OP_LTE',        0x07);
+define("OP_BETWEEN",    0x00);
+define("OP_NOTBETWEEN", 0x01);
+define("OP_EQUAL",      0x02);
+define("OP_NOTEQUAL",   0x03);
+define("OP_GT",         0x04);
+define("OP_LT",         0x05);
+define("OP_GTE",        0x06);
+define("OP_LTE",        0x07);
 
 /**
 * Baseclass for generating Excel DV records (validations)
@@ -45,27 +47,27 @@ define('OP_LTE',        0x07);
 */
 class Spreadsheet_Excel_Writer_Validator
 {
-   public $_type;
-   public $_style;
-   public $_fixedList;
-   public $_blank;
-   public $_incell;
-   public $_showprompt;
-   public $_showerror;
-   public $_title_prompt;
-   public $_descr_prompt;
-   public $_title_error;
-   public $_descr_error;
-   public $_operator;
-   public $_formula1;
-   public $_formula2;
+   var $_type;
+   var $_style;
+   var $_fixedList;
+   var $_blank;
+   var $_incell;
+   var $_showprompt;
+   var $_showerror;
+   var $_title_prompt;
+   var $_descr_prompt;
+   var $_title_error;
+   var $_descr_error;
+   var $_operator;
+   var $_formula1;
+   var $_formula2;
     /**
     * The parser from the workbook. Used to parse validation formulas also
     * @var Spreadsheet_Excel_Writer_Parser
     */
-    public $_parser;
+    var $_parser;
 
-    public function __construct($parser)
+    function Spreadsheet_Excel_Writer_Validator(&$parser)
     {
         $this->_parser       = $parser;
         $this->_type         = 0x01; // FIXME: add method for setting datatype
@@ -84,41 +86,41 @@ class Spreadsheet_Excel_Writer_Validator
         $this->_formula2    = '';
     }
 
-   public function setPrompt($promptTitle = "\x00", $promptDescription = "\x00", $showPrompt = true)
+   function setPrompt($promptTitle = "\x00", $promptDescription = "\x00", $showPrompt = true)
    {
       $this->_showprompt = $showPrompt;
       $this->_title_prompt = $promptTitle;
       $this->_descr_prompt = $promptDescription;
    }
 
-   public function setError($errorTitle = "\x00", $errorDescription = "\x00", $showError = true)
+   function setError($errorTitle = "\x00", $errorDescription = "\x00", $showError = true)
    {
       $this->_showerror = $showError;
       $this->_title_error = $errorTitle;
       $this->_descr_error = $errorDescription;
    }
 
-   public function allowBlank()
+   function allowBlank()
    {
       $this->_blank = true;
    }
 
-   public function onInvalidStop()
+   function onInvalidStop()
    {
       $this->_style = 0x00;
    }
 
-    public function onInvalidWarn()
+    function onInvalidWarn()
     {
         $this->_style = 0x01;
     }
 
-    public function onInvalidInfo()
+    function onInvalidInfo()
     {
         $this->_style = 0x02;
     }
 
-    public function setFormula1($formula)
+    function setFormula1($formula)
     {
         // Parse the formula using the parser in Parser.php
         $error = $this->_parser->parse($formula);
@@ -133,7 +135,7 @@ class Spreadsheet_Excel_Writer_Validator
         return true;
     }
 
-    public function setFormula2($formula)
+    function setFormula2($formula)
     {
         // Parse the formula using the parser in Parser.php
         $error = $this->_parser->parse($formula);
@@ -148,7 +150,7 @@ class Spreadsheet_Excel_Writer_Validator
         return true;
     }
 
-    public function _getOptions()
+    function _getOptions()
     {
         $options = $this->_type;
         $options |= $this->_style << 3;
@@ -172,7 +174,7 @@ class Spreadsheet_Excel_Writer_Validator
       return $options;
    }
 
-   public function _getData()
+   function _getData()
    {
       $title_prompt_len = strlen($this->_title_prompt);
       $descr_prompt_len = strlen($this->_descr_prompt);
@@ -197,13 +199,13 @@ class Spreadsheet_Excel_Writer_Validator
 
 /*class Spreadsheet_Excel_Writer_Validation_List extends Spreadsheet_Excel_Writer_Validation
 {
-   public function Spreadsheet_Excel_Writer_Validation_list()
+   function Spreadsheet_Excel_Writer_Validation_list()
    {
       parent::Spreadsheet_Excel_Writer_Validation();
       $this->_type = 0x03;
    }
 
-   public function setList($source, $incell = true)
+   function setList($source, $incell = true)
    {
       $this->_incell = $incell;
       $this->_fixedList = true;
@@ -212,13 +214,13 @@ class Spreadsheet_Excel_Writer_Validator
       $this->_formula1 = pack("CCC", 0x17, strlen($source), 0x0c) . $source;
    }
 
-   public function setRow($row, $col1, $col2, $incell = true)
+   function setRow($row, $col1, $col2, $incell = true)
    {
       $this->_incell = $incell;
       //$this->_formula1 = ...;
    }
 
-   public function setCol($col, $row1, $row2, $incell = true)
+   function setCol($col, $row1, $row2, $incell = true)
    {
       $this->_incell = $incell;
       //$this->_formula1 = ...;
diff --git a/Spreadsheet/Excel/Writer/Workbook.php b/Spreadsheet/Excel/Writer/Workbook.php
index ed9998b..a1c97f3 100644
--- a/Spreadsheet/Excel/Writer/Workbook.php
+++ b/Spreadsheet/Excel/Writer/Workbook.php
@@ -32,10 +32,12 @@
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
-require_once __DIR__ . '/Format.php';
-require_once __DIR__ . '/BIFFwriter.php';
-require_once __DIR__ . '/Worksheet.php';
-require_once __DIR__ . '/Parser.php';
+require_once 'Spreadsheet/Excel/Writer/Format.php';
+require_once 'Spreadsheet/Excel/Writer/BIFFwriter.php';
+require_once 'Spreadsheet/Excel/Writer/Worksheet.php';
+require_once 'Spreadsheet/Excel/Writer/Parser.php';
+require_once 'OLE/PPS/Root.php';
+require_once 'OLE/PPS/File.php';
 
 /**
 * Class for generating Excel Spreadsheets
@@ -51,132 +53,117 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     * Filename for the Workbook
     * @var string
     */
-    public $fileName;
+    var $_filename;
 
     /**
     * Formula parser
-    * @var Spreadsheet_Excel_Writer_Parser
+    * @var object Parser
     */
-    public $parser;
+    var $_parser;
 
     /**
     * Flag for 1904 date system (0 => base date is 1900, 1 => base date is 1904)
     * @var integer
     */
-    public $flagFor1904;
+    var $_1904;
 
     /**
     * The active worksheet of the workbook (0 indexed)
     * @var integer
     */
-    public $activeSheet;
+    var $_activesheet;
 
     /**
     * 1st displayed worksheet in the workbook (0 indexed)
     * @var integer
     */
-    public $firstSheet;
+    var $_firstsheet;
 
     /**
     * Number of workbook tabs selected
     * @var integer
     */
-    public $selectedWorkBook;
+    var $_selected;
 
     /**
     * Index for creating adding new formats to the workbook
     * @var integer
     */
-    public $xf_index;
+    var $_xf_index;
 
     /**
     * Flag for preventing close from being called twice.
     * @var integer
     * @see close()
     */
-    public $fileIsClosed;
+    var $_fileclosed;
 
     /**
     * The BIFF file size for the workbook.
     * @var integer
-    * @see calcSheetOffsets()
+    * @see _calcSheetOffsets()
     */
-    public $biffSize;
+    var $_biffsize;
 
     /**
     * The default sheetname for all sheets created.
     * @var string
     */
-    public $sheetName;
+    var $_sheetname;
 
     /**
     * The default XF format.
-    * @var Spreadsheet_Excel_Writer_Format
+    * @var object Format
     */
-    public $temporaryFormat;
+    var $_tmp_format;
 
     /**
     * Array containing references to all of this workbook's worksheets
     * @var array
     */
-    public $workSheet;
+    var $_worksheets;
 
     /**
-    * Array of sheet names for creating the EXTERNSHEET records
+    * Array of sheetnames for creating the EXTERNSHEET records
     * @var array
     */
-    public $sheetNames;
+    var $_sheetnames;
 
     /**
     * Array containing references to all of this workbook's formats
-    * @var array|Spreadsheet_Excel_Writer_Format[]
+    * @var array
     */
-    public $formats;
+    var $_formats;
 
     /**
     * Array containing the colour palette
     * @var array
     */
-    public $palette;
+    var $_palette;
 
     /**
     * The default format for URLs.
-    * @var Spreadsheet_Excel_Writer_Format
+    * @var object Format
     */
-    public $urlFormat;
+    var $_url_format;
 
     /**
     * The codepage indicates the text encoding used for strings
     * @var integer
     */
-    public $codePage;
+    var $_codepage;
 
     /**
     * The country code used for localization
     * @var integer
     */
-    public $countryCode;
+    var $_country_code;
 
     /**
-    * number of bytes for size info of strings
+    * number of bytes for sizeinfo of strings
     * @var integer
     */
-    public $stringSizeInfoSize;
-
-    /** @var int */
-    public $totalStringLength;
-
-    /** @var int */
-    public $uniqueString;
-
-    /** @var array */
-    public $tableOfStrings;
-
-    /** @var int */
-    public $stringSizeInfo;
-
-    /** @var array */
-    public $blockSize;
+    var $_string_sizeinfo_size;
 
     /** @var int */
     public $timestamp;
@@ -184,41 +171,41 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     /**
     * Class constructor
     *
-    * @param string $fileName for storing the workbook. "-" for writing to stdout.
+    * @param string filename for storing the workbook. "-" for writing to stdout.
     * @access public
     */
-    public function __construct($fileName)
+    function Spreadsheet_Excel_Writer_Workbook($filename)
     {
         // It needs to call its parent's constructor explicitly
-        parent::__construct();
+        $this->Spreadsheet_Excel_Writer_BIFFwriter();
 
-        $this->fileName         = $fileName;
-        $this->parser           = new Spreadsheet_Excel_Writer_Parser($this->byteOrder, $this->BIFF_version);
-        $this->flagFor1904      = 0;
-        $this->activeSheet      = 0;
-        $this->firstSheet       = 0;
-        $this->selectedWorkBook = 0;
-        $this->xf_index         = 16; // 15 style XF's and 1 cell XF.
-        $this->fileIsClosed       = 0;
-        $this->biffSize         = 0;
-        $this->sheetName        = 'Sheet';
-        $this->temporaryFormat  = new Spreadsheet_Excel_Writer_Format($this->BIFF_version);
-        $this->workSheet        = array();
-        $this->sheetNames       = array();
-        $this->formats          = array();
-        $this->palette          = array();
-        $this->codePage         = 0x04E4; // FIXME: should change for BIFF8
-        $this->countryCode      = -1;
-        $this->stringSizeInfo   = 3;
+        $this->_filename         = $filename;
+        $this->_parser           = new Spreadsheet_Excel_Writer_Parser($this->_byte_order, $this->_BIFF_version);
+        $this->_1904             = 0;
+        $this->_activesheet      = 0;
+        $this->_firstsheet       = 0;
+        $this->_selected         = 0;
+        $this->_xf_index         = 16; // 15 style XF's and 1 cell XF.
+        $this->_fileclosed       = 0;
+        $this->_biffsize         = 0;
+        $this->_sheetname        = 'Sheet';
+        $this->_tmp_format       = new Spreadsheet_Excel_Writer_Format($this->_BIFF_version);
+        $this->_worksheets       = array();
+        $this->_sheetnames       = array();
+        $this->_formats          = array();
+        $this->_palette          = array();
+        $this->_codepage         = 0x04E4; // FIXME: should change for BIFF8
+        $this->_country_code     = -1;
+        $this->_string_sizeinfo  = 3;
 
         // Add the default format for hyperlinks
-        $this->urlFormat            = $this->addFormat(array('color' => 'blue', 'underline' => 1));
-        $this->totalStringLength    = 0;
-        $this->uniqueString         = 0;
-        $this->tableOfStrings       = array();
+        $this->_url_format =& $this->addFormat(array('color' => 'blue', 'underline' => 1));
+        $this->_str_total       = 0;
+        $this->_str_unique      = 0;
+        $this->_str_table       = array();
         $this->timestamp            = time();
 
-        $this->setPaletteXl97();
+        $this->_setPaletteXl97();
     }
 
     /**
@@ -228,25 +215,21 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     * @access public
     * @return mixed true on success. PEAR_Error on failure
     */
-    public function close()
+    function close()
     {
-        if ($this->fileIsClosed) { // Prevent close() from being called twice.
+        if ($this->_fileclosed) { // Prevent close() from being called twice.
             return true;
         }
-
-        $resource = $this->storeWorkbook();
-
-        if ($this->isError($resource)) {
-            return $this->raiseError($resource->getMessage());
+        $res = $this->_storeWorkbook();
+        if ($this->isError($res)) {
+            return $this->raiseError($res->getMessage());
         }
-
-        $this->fileIsClosed = 1;
-
+        $this->_fileclosed = 1;
         return true;
     }
 
     /**
-    * An accessor for the workSheet[] array
+    * An accessor for the _worksheets[] array
     * Returns an array of the worksheet objects in a workbook
     * It actually calls to worksheets()
     *
@@ -254,21 +237,21 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     * @see worksheets()
     * @return array
     */
-    public function sheets()
+    function sheets()
     {
         return $this->worksheets();
     }
 
     /**
-    * An accessor for the workSheet[] array.
+    * An accessor for the _worksheets[] array.
     * Returns an array of the worksheet objects in a workbook
     *
     * @access public
     * @return array
     */
-    public function worksheets()
+    function worksheets()
     {
-        return $this->workSheet;
+        return $this->_worksheets;
     }
 
     /**
@@ -281,28 +264,28 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     * @access public
     * @param integer $version The BIFF version
     */
-    public function setVersion($version)
+    function setVersion($version)
     {
         if ($version == 8) { // only accept version 8
             $version = 0x0600;
-            $this->BIFF_version = $version;
+            $this->_BIFF_version = $version;
             // change BIFFwriter limit for CONTINUE records
-            $this->limit = 8228;
-            $this->temporaryFormat->_BIFF_version = $version;
-            $this->urlFormat->_BIFF_version = $version;
-            $this->parser->_BIFF_version = $version;
-            $this->codePage = 0x04B0;
+            $this->_limit = 8228;
+            $this->_tmp_format->_BIFF_version = $version;
+            $this->_url_format->_BIFF_version = $version;
+            $this->_parser->_BIFF_version = $version;
+            $this->_codepage = 0x04B0;
 
-            $total_worksheets = count($this->workSheet);
+            $total_worksheets = count($this->_worksheets);
             // change version for all worksheets too
-            for ($i = 0; $i < $total_worksheets; ++$i) {
-                $this->workSheet[$i]->_BIFF_version = $version;
+            for ($i = 0; $i < $total_worksheets; $i++) {
+                $this->_worksheets[$i]->_BIFF_version = $version;
             }
 
-            $total_formats = count($this->formats);
+            $total_formats = count($this->_formats);
             // change version for all formats too
-            for ($i = 0; $i < $total_formats; ++$i) {
-                $this->formats[$i]->_BIFF_version = $version;
+            for ($i = 0; $i < $total_formats; $i++) {
+                $this->_formats[$i]->_BIFF_version = $version;
             }
         }
     }
@@ -314,9 +297,9 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     * @param integer $code Is the international calling country code for the
     *                      chosen country.
     */
-    public function setCountry($code)
+    function setCountry($code)
     {
-        $this->countryCode = $code;
+        $this->_country_code = $code;
     }
 
     /**
@@ -329,75 +312,61 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     * @return mixed reference to a worksheet object on success, PEAR_Error
     *               on failure
     */
-    public function addWorksheet($name = '')
+    function &addWorksheet($name = '')
     {
-        $index     = count($this->workSheet);
-        $sheetName = $this->sheetName;
+        $index     = count($this->_worksheets);
+        $sheetname = $this->_sheetname;
 
         if ($name == '') {
-            $name = $sheetName . ($index+1);
+            $name = $sheetname.($index+1);
         }
 
         // Check that sheetname is <= 31 chars (Excel limit before BIFF8).
-        if ($this->BIFF_version != 0x0600) {
+        if ($this->_BIFF_version != 0x0600)
+        {
             if (strlen($name) > 31) {
-                return $this->raiseError('Sheetname $name must be <= 31 chars');
+                return $this->raiseError("Sheetname $name must be <= 31 chars");
             }
         } else {
-            if (function_exists('iconv')) {
+            if(function_exists('iconv')) {
                 $name = iconv('UTF-8','UTF-16LE',$name);
             }
         }
 
         // Check that the worksheet name doesn't already exist: a fatal Excel error.
-        $total_worksheets = count($this->workSheet);
-
-        for ($i = 0; $i < $total_worksheets; ++$i) {
-            if ($this->workSheet[$i]->getName() == $name) {
+        $total_worksheets = count($this->_worksheets);
+        for ($i = 0; $i < $total_worksheets; $i++) {
+            if ($this->_worksheets[$i]->getName() == $name) {
                 return $this->raiseError("Worksheet '$name' already exists");
             }
         }
 
-        $worksheet = new Spreadsheet_Excel_Writer_Worksheet(
-            $this->BIFF_version,
-            $name,
-            $index,
-            $this->activeSheet,
-            $this->firstSheet,
-            $this->totalStringLength,
-            $this->uniqueString,
-            $this->tableOfStrings,
-            $this->urlFormat,
-            $this->parser,
-            $this->temporaryDirectory
-        );
-
-        $this->workSheet[$index]    = $worksheet;    // Store ref for iterator
-        $this->sheetNames[$index]   = $name;          // Store EXTERNSHEET names
-        $this->parser->setExtSheet($name, $index);  // Register worksheet name with parser
+        $worksheet = new Spreadsheet_Excel_Writer_Worksheet($this->_BIFF_version,
+                                   $name, $index,
+                                   $this->_activesheet, $this->_firstsheet,
+                                   $this->_str_total, $this->_str_unique,
+                                   $this->_str_table, $this->_url_format,
+                                   $this->_parser, $this->_tmp_dir);
 
+        $this->_worksheets[$index] = &$worksheet;    // Store ref for iterator
+        $this->_sheetnames[$index] = $name;          // Store EXTERNSHEET names
+        $this->_parser->setExtSheet($name, $index);  // Register worksheet name with parser
         return $worksheet;
     }
 
     /**
-     * Add a new format to the Excel workbook.
-     * Also, pass any properties to the Format constructor.
-     *
-     * @access public
-     * @param array $properties array with properties for initializing the format.
-     * @return Spreadsheet_Excel_Writer_Format Spreadsheet_Excel_Writer_Format reference to an Excel Format
-     */
-    public function addFormat($properties = array())
+    * Add a new format to the Excel workbook.
+    * Also, pass any properties to the Format constructor.
+    *
+    * @access public
+    * @param array $properties array with properties for initializing the format.
+    * @return &Spreadsheet_Excel_Writer_Format reference to an Excel Format
+    */
+    function &addFormat($properties = array())
     {
-        $format = new Spreadsheet_Excel_Writer_Format(
-            $this->BIFF_version,
-            $this->xf_index,
-            $properties
-        );
-
-        $this->xf_index    += 1;
-        $this->formats[]    = $format;
-
+        $format = new Spreadsheet_Excel_Writer_Format($this->_BIFF_version, $this->_xf_index, $properties);
+        $this->_xf_index += 1;
+        $this->_formats[] = &$format;
         return $format;
     }
 
@@ -405,13 +374,13 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
      * Create new validator.
      *
      * @access public
-     * @return Spreadsheet_Excel_Writer_Validator reference to a Validator
+     * @return &Spreadsheet_Excel_Writer_Validator reference to a Validator
      */
-    public function addValidator()
+    function &addValidator()
     {
+        include_once 'Spreadsheet/Excel/Writer/Validator.php';
         /* FIXME: check for successful inclusion*/
-        $valid = new Spreadsheet_Excel_Writer_Validator($this->parser);
-
+        $valid = new Spreadsheet_Excel_Writer_Validator($this->_parser);
         return $valid;
     }
 
@@ -425,7 +394,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     * @param integer $blue  blue RGB value [0-255]
     * @return integer The palette index for the custom color
     */
-    public function setCustomColor($index, $red, $green, $blue)
+    function setCustomColor($index, $red, $green, $blue)
     {
         // Match a HTML #xxyyzz style parameter
         /*if (defined $_[1] and $_[1] =~ /^#(\w\w)(\w\w)(\w\w)/ ) {
@@ -435,7 +404,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
         // Check that the colour index is the right range
         if ($index < 8 or $index > 64) {
             // TODO: assign real error codes
-            return $this->raiseError('Color index $index outside range: 8 <= index <= 64');
+            return $this->raiseError("Color index $index outside range: 8 <= index <= 64");
         }
 
         // Check that the colour components are in the right range
@@ -443,15 +412,14 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
             ($green < 0 or $green > 255) ||
             ($blue  < 0 or $blue  > 255))
         {
-            return $this->raiseError('Color component outside range: 0 <= color <= 255');
+            return $this->raiseError("Color component outside range: 0 <= color <= 255");
         }
 
         $index -= 8; // Adjust colour index (wingless dragonfly)
 
         // Set the RGB value
-        $this->palette[$index] = array($red, $green, $blue, 0);
-
-        return ($index + 8);
+        $this->_palette[$index] = array($red, $green, $blue, 0);
+        return($index + 8);
     }
 
     /**
@@ -459,66 +427,66 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function setPaletteXl97()
+    function _setPaletteXl97()
     {
-        $this->palette = array(
-            array(0x00, 0x00, 0x00, 0x00),   // 8
-            array(0xff, 0xff, 0xff, 0x00),   // 9
-            array(0xff, 0x00, 0x00, 0x00),   // 10
-            array(0x00, 0xff, 0x00, 0x00),   // 11
-            array(0x00, 0x00, 0xff, 0x00),   // 12
-            array(0xff, 0xff, 0x00, 0x00),   // 13
-            array(0xff, 0x00, 0xff, 0x00),   // 14
-            array(0x00, 0xff, 0xff, 0x00),   // 15
-            array(0x80, 0x00, 0x00, 0x00),   // 16
-            array(0x00, 0x80, 0x00, 0x00),   // 17
-            array(0x00, 0x00, 0x80, 0x00),   // 18
-            array(0x80, 0x80, 0x00, 0x00),   // 19
-            array(0x80, 0x00, 0x80, 0x00),   // 20
-            array(0x00, 0x80, 0x80, 0x00),   // 21
-            array(0xc0, 0xc0, 0xc0, 0x00),   // 22
-            array(0x80, 0x80, 0x80, 0x00),   // 23
-            array(0x99, 0x99, 0xff, 0x00),   // 24
-            array(0x99, 0x33, 0x66, 0x00),   // 25
-            array(0xff, 0xff, 0xcc, 0x00),   // 26
-            array(0xcc, 0xff, 0xff, 0x00),   // 27
-            array(0x66, 0x00, 0x66, 0x00),   // 28
-            array(0xff, 0x80, 0x80, 0x00),   // 29
-            array(0x00, 0x66, 0xcc, 0x00),   // 30
-            array(0xcc, 0xcc, 0xff, 0x00),   // 31
-            array(0x00, 0x00, 0x80, 0x00),   // 32
-            array(0xff, 0x00, 0xff, 0x00),   // 33
-            array(0xff, 0xff, 0x00, 0x00),   // 34
-            array(0x00, 0xff, 0xff, 0x00),   // 35
-            array(0x80, 0x00, 0x80, 0x00),   // 36
-            array(0x80, 0x00, 0x00, 0x00),   // 37
-            array(0x00, 0x80, 0x80, 0x00),   // 38
-            array(0x00, 0x00, 0xff, 0x00),   // 39
-            array(0x00, 0xcc, 0xff, 0x00),   // 40
-            array(0xcc, 0xff, 0xff, 0x00),   // 41
-            array(0xcc, 0xff, 0xcc, 0x00),   // 42
-            array(0xff, 0xff, 0x99, 0x00),   // 43
-            array(0x99, 0xcc, 0xff, 0x00),   // 44
-            array(0xff, 0x99, 0xcc, 0x00),   // 45
-            array(0xcc, 0x99, 0xff, 0x00),   // 46
-            array(0xff, 0xcc, 0x99, 0x00),   // 47
-            array(0x33, 0x66, 0xff, 0x00),   // 48
-            array(0x33, 0xcc, 0xcc, 0x00),   // 49
-            array(0x99, 0xcc, 0x00, 0x00),   // 50
-            array(0xff, 0xcc, 0x00, 0x00),   // 51
-            array(0xff, 0x99, 0x00, 0x00),   // 52
-            array(0xff, 0x66, 0x00, 0x00),   // 53
-            array(0x66, 0x66, 0x99, 0x00),   // 54
-            array(0x96, 0x96, 0x96, 0x00),   // 55
-            array(0x00, 0x33, 0x66, 0x00),   // 56
-            array(0x33, 0x99, 0x66, 0x00),   // 57
-            array(0x00, 0x33, 0x00, 0x00),   // 58
-            array(0x33, 0x33, 0x00, 0x00),   // 59
-            array(0x99, 0x33, 0x00, 0x00),   // 60
-            array(0x99, 0x33, 0x66, 0x00),   // 61
-            array(0x33, 0x33, 0x99, 0x00),   // 62
-            array(0x33, 0x33, 0x33, 0x00),   // 63
-        );
+        $this->_palette = array(
+                           array(0x00, 0x00, 0x00, 0x00),   // 8
+                           array(0xff, 0xff, 0xff, 0x00),   // 9
+                           array(0xff, 0x00, 0x00, 0x00),   // 10
+                           array(0x00, 0xff, 0x00, 0x00),   // 11
+                           array(0x00, 0x00, 0xff, 0x00),   // 12
+                           array(0xff, 0xff, 0x00, 0x00),   // 13
+                           array(0xff, 0x00, 0xff, 0x00),   // 14
+                           array(0x00, 0xff, 0xff, 0x00),   // 15
+                           array(0x80, 0x00, 0x00, 0x00),   // 16
+                           array(0x00, 0x80, 0x00, 0x00),   // 17
+                           array(0x00, 0x00, 0x80, 0x00),   // 18
+                           array(0x80, 0x80, 0x00, 0x00),   // 19
+                           array(0x80, 0x00, 0x80, 0x00),   // 20
+                           array(0x00, 0x80, 0x80, 0x00),   // 21
+                           array(0xc0, 0xc0, 0xc0, 0x00),   // 22
+                           array(0x80, 0x80, 0x80, 0x00),   // 23
+                           array(0x99, 0x99, 0xff, 0x00),   // 24
+                           array(0x99, 0x33, 0x66, 0x00),   // 25
+                           array(0xff, 0xff, 0xcc, 0x00),   // 26
+                           array(0xcc, 0xff, 0xff, 0x00),   // 27
+                           array(0x66, 0x00, 0x66, 0x00),   // 28
+                           array(0xff, 0x80, 0x80, 0x00),   // 29
+                           array(0x00, 0x66, 0xcc, 0x00),   // 30
+                           array(0xcc, 0xcc, 0xff, 0x00),   // 31
+                           array(0x00, 0x00, 0x80, 0x00),   // 32
+                           array(0xff, 0x00, 0xff, 0x00),   // 33
+                           array(0xff, 0xff, 0x00, 0x00),   // 34
+                           array(0x00, 0xff, 0xff, 0x00),   // 35
+                           array(0x80, 0x00, 0x80, 0x00),   // 36
+                           array(0x80, 0x00, 0x00, 0x00),   // 37
+                           array(0x00, 0x80, 0x80, 0x00),   // 38
+                           array(0x00, 0x00, 0xff, 0x00),   // 39
+                           array(0x00, 0xcc, 0xff, 0x00),   // 40
+                           array(0xcc, 0xff, 0xff, 0x00),   // 41
+                           array(0xcc, 0xff, 0xcc, 0x00),   // 42
+                           array(0xff, 0xff, 0x99, 0x00),   // 43
+                           array(0x99, 0xcc, 0xff, 0x00),   // 44
+                           array(0xff, 0x99, 0xcc, 0x00),   // 45
+                           array(0xcc, 0x99, 0xff, 0x00),   // 46
+                           array(0xff, 0xcc, 0x99, 0x00),   // 47
+                           array(0x33, 0x66, 0xff, 0x00),   // 48
+                           array(0x33, 0xcc, 0xcc, 0x00),   // 49
+                           array(0x99, 0xcc, 0x00, 0x00),   // 50
+                           array(0xff, 0xcc, 0x00, 0x00),   // 51
+                           array(0xff, 0x99, 0x00, 0x00),   // 52
+                           array(0xff, 0x66, 0x00, 0x00),   // 53
+                           array(0x66, 0x66, 0x99, 0x00),   // 54
+                           array(0x96, 0x96, 0x96, 0x00),   // 55
+                           array(0x00, 0x33, 0x66, 0x00),   // 56
+                           array(0x33, 0x99, 0x66, 0x00),   // 57
+                           array(0x00, 0x33, 0x00, 0x00),   // 58
+                           array(0x33, 0x33, 0x00, 0x00),   // 59
+                           array(0x99, 0x33, 0x00, 0x00),   // 60
+                           array(0x99, 0x33, 0x66, 0x00),   // 61
+                           array(0x33, 0x33, 0x99, 0x00),   // 62
+                           array(0x33, 0x33, 0x33, 0x00),   // 63
+                         );
     }
 
     /**
@@ -528,82 +496,73 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     * @access private
     * @return mixed true on success. PEAR_Error on failure
     */
-    protected function storeWorkbook()
+    function _storeWorkbook()
     {
-        if (count($this->workSheet) == 0) {
+        if (count($this->_worksheets) == 0) {
             return true;
         }
 
         // Ensure that at least one worksheet has been selected.
-        if ($this->activeSheet == 0) {
-            $this->workSheet[0]->selected = 1;
+        if ($this->_activesheet == 0) {
+            $this->_worksheets[0]->selected = 1;
         }
 
         // Calculate the number of selected worksheet tabs and call the finalization
         // methods for each worksheet
-        $totalNumberOfWorkSheets = count($this->workSheet);
-
-        for ($i = 0; $i < $totalNumberOfWorkSheets; ++$i) {
-            if ($this->workSheet[$i]->selected) {
-                ++$this->selectedWorkBook;
+        $total_worksheets = count($this->_worksheets);
+        for ($i = 0; $i < $total_worksheets; $i++) {
+            if ($this->_worksheets[$i]->selected) {
+                $this->_selected++;
             }
-
-            $this->workSheet[$i]->close($this->sheetNames);
+            $this->_worksheets[$i]->close($this->_sheetnames);
         }
 
         // Add Workbook globals
-        $this->storeBof(0x0005);
-        $this->storeCodepage();
-
-        if ($this->BIFF_version == 0x0600) {
-            $this->storeWindow1();
+        $this->_storeBof(0x0005);
+        $this->_storeCodepage();
+        if ($this->_BIFF_version == 0x0600) {
+            $this->_storeWindow1();
         }
-
-        if ($this->BIFF_version == 0x0500) {
-            $this->storeExterns();    // For print area and repeat rows
+        if ($this->_BIFF_version == 0x0500) {
+            $this->_storeExterns();    // For print area and repeat rows
         }
-
-        $this->storeNames();      // For print area and repeat rows
-
-        if ($this->BIFF_version == 0x0500) {
-            $this->storeWindow1();
+        $this->_storeNames();      // For print area and repeat rows
+        if ($this->_BIFF_version == 0x0500) {
+            $this->_storeWindow1();
         }
-
-        $this->storeDatemode();
-        $this->storeAllFonts();
-        $this->storeAllNumFormats();
-        $this->storeAllXfs();
-        $this->storeAllStyles();
-        $this->storePalette();
-        $this->calcSheetOffsets();
+        $this->_storeDatemode();
+        $this->_storeAllFonts();
+        $this->_storeAllNumFormats();
+        $this->_storeAllXfs();
+        $this->_storeAllStyles();
+        $this->_storePalette();
+        $this->_calcSheetOffsets();
 
         // Add BOUNDSHEET records
-        for ($i = 0; $i < $totalNumberOfWorkSheets; ++$i) {
-            $this->storeBoundsheet($this->workSheet[$i]->name,$this->workSheet[$i]->offset);
+        for ($i = 0; $i < $total_worksheets; $i++) {
+            $this->_storeBoundsheet($this->_worksheets[$i]->name,$this->_worksheets[$i]->offset);
         }
 
-        if ($this->countryCode != -1) {
-            $this->storeCountry();
+        if ($this->_country_code != -1) {
+            $this->_storeCountry();
         }
 
-        if ($this->BIFF_version == 0x0600) {
-            //$this->storeSupbookInternal();
+        if ($this->_BIFF_version == 0x0600) {
+            //$this->_storeSupbookInternal();
             /* TODO: store external SUPBOOK records and XCT and CRN records
             in case of external references for BIFF8 */
-            //$this->storeExternsheetBiff8();
-            $this->storeSharedStringsTable();
+            //$this->_storeExternsheetBiff8();
+            $this->_storeSharedStringsTable();
         }
 
         // End Workbook globals
-        $this->storeEof();
+        $this->_storeEof();
 
         // Store the workbook in an OLE container
-        $res = $this->storeOLEFile();
-
+        $res = $this->_storeOLEFile();
         if ($this->isError($res)) {
             return $this->raiseError($res->getMessage());
         }
-
         return true;
     }
 
@@ -613,46 +572,38 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     * @access private
     * @return mixed true on success. PEAR_Error on failure
     */
-    protected function storeOLEFile()
+    function _storeOLEFile()
     {
-        if ($this->BIFF_version == 0x0600) {
+        if($this->_BIFF_version == 0x0600) {
             $OLE = new OLE_PPS_File(OLE::Asc2Ucs('Workbook'));
         } else {
             $OLE = new OLE_PPS_File(OLE::Asc2Ucs('Book'));
         }
-
-        if ($this->temporaryDirectory != '') {
-            $OLE->setTempDir($this->temporaryDirectory);
+        if ($this->_tmp_dir != '') {
+            $OLE->setTempDir($this->_tmp_dir);
         }
-
         $res = $OLE->init();
-
         if ($this->isError($res)) {
-            return $this->raiseError('OLE Error: ' . $res->getMessage());
+            return $this->raiseError("OLE Error: ".$res->getMessage());
         }
+        $OLE->append($this->_data);
 
-        $OLE->append($this->data);
-
-        $total_worksheets = count($this->workSheet);
-
-        for ($i = 0; $i < $total_worksheets; ++$i) {
-            while ($tmp = $this->workSheet[$i]->getData()) {
+        $total_worksheets = count($this->_worksheets);
+        for ($i = 0; $i < $total_worksheets; $i++) {
+            while ($tmp = $this->_worksheets[$i]->getData()) {
                 $OLE->append($tmp);
             }
         }
 
         $root = new OLE_PPS_Root($this->timestamp, $this->timestamp, array($OLE));
-
-        if ($this->temporaryDirectory != '') {
-            $root->setTempDir($this->temporaryDirectory);
+        if ($this->_tmp_dir != '') {
+            $root->setTempDir($this->_tmp_dir);
         }
 
-        $res = $root->save($this->fileName);
-
+        $res = $root->save($this->_filename);
         if ($this->isError($res)) {
-            return $this->raiseError('OLE Error: ' . $res->getMessage());
+            return $this->raiseError("OLE Error: ".$res->getMessage());
         }
-
         return true;
     }
 
@@ -661,42 +612,38 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function calcSheetOffsets()
+    function _calcSheetOffsets()
     {
-        if ($this->BIFF_version == 0x0600) {
-            $lengthOfTheBoundSheet = 12;  // fixed length for a BOUNDSHEET record
+        if ($this->_BIFF_version == 0x0600) {
+            $boundsheet_length = 12;  // fixed length for a BOUNDSHEET record
         } else {
-            $lengthOfTheBoundSheet = 11;
+            $boundsheet_length = 11;
         }
+        $EOF               = 4;
+        $offset            = $this->_datasize;
 
-        $EOF    = 4;
-        $offset = $this->dataSize;
-
-        if ($this->BIFF_version == 0x0600) {
+        if ($this->_BIFF_version == 0x0600) {
             // add the length of the SST
             /* TODO: check this works for a lot of strings (> 8224 bytes) */
-            $offset += $this->calculateSharedStringsSizes();
-
-            if ($this->countryCode != -1) {
+            $offset += $this->_calculateSharedStringsSizes();
+            if ($this->_country_code != -1) {
                 $offset += 8; // adding COUNTRY record
             }
             // add the lenght of SUPBOOK, EXTERNSHEET and NAME records
             //$offset += 8; // FIXME: calculate real value when storing the records
         }
-        $totalNumberOfWorkSheets = count($this->workSheet);
+        $total_worksheets = count($this->_worksheets);
         // add the length of the BOUNDSHEET records
-
-        for ($i = 0; $i < $totalNumberOfWorkSheets; ++$i) {
-            $offset += $lengthOfTheBoundSheet + strlen($this->workSheet[$i]->name);
+        for ($i = 0; $i < $total_worksheets; $i++) {
+            $offset += $boundsheet_length + strlen($this->_worksheets[$i]->name);
         }
         $offset += $EOF;
 
-        for ($i = 0; $i < $totalNumberOfWorkSheets; ++$i) {
-            $this->workSheet[$i]->offset = $offset;
-            $offset += $this->workSheet[$i]->_datasize;
+        for ($i = 0; $i < $total_worksheets; $i++) {
+            $this->_worksheets[$i]->offset = $offset;
+            $offset += $this->_worksheets[$i]->_datasize;
         }
-
-        $this->biffSize = $offset;
+        $this->_biffsize = $offset;
     }
 
     /**
@@ -704,17 +651,17 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function storeAllFonts()
+    function _storeAllFonts()
     {
         // tmp_format is added by the constructor. We use this to write the default XF's
-        $format = $this->temporaryFormat;
+        $format = $this->_tmp_format;
         $font   = $format->getFont();
 
         // Note: Fonts are 0-indexed. According to the SDK there is no index 4,
         // so the following fonts are 0, 1, 2, 3, 5
         //
         for ($i = 1; $i <= 5; $i++){
-            $this->append($font);
+            $this->_append($font);
         }
 
         // Iterate through the XF objects and write a FONT record if it isn't the
@@ -723,24 +670,22 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
         $fonts = array();
         $index = 6;                  // The first user defined FONT
 
-        $key = $format->getFontKey(); // The default font from temporaryFormat
+        $key = $format->getFontKey(); // The default font from _tmp_format
         $fonts[$key] = 0;             // Index of the default font
 
-        $totalNumberOfFormats = count($this->formats);
-
-        for ($i = 0; $i < $totalNumberOfFormats; ++$i) {
-            $key = $this->formats[$i]->getFontKey();
-
+        $total_formats = count($this->_formats);
+        for ($i = 0; $i < $total_formats; $i++) {
+            $key = $this->_formats[$i]->getFontKey();
             if (isset($fonts[$key])) {
                 // FONT has already been used
-                $this->formats[$i]->font_index = $fonts[$key];
+                $this->_formats[$i]->font_index = $fonts[$key];
             } else {
                 // Add a new FONT record
                 $fonts[$key]        = $index;
-                $this->formats[$i]->font_index = $index;
-                ++$index;
-                $font = $this->formats[$i]->getFont();
-                $this->append($font);
+                $this->_formats[$i]->font_index = $index;
+                $index++;
+                $font = $this->_formats[$i]->getFont();
+                $this->_append($font);
             }
         }
     }
@@ -750,48 +695,46 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function storeAllNumFormats()
+    function _storeAllNumFormats()
     {
         // Leaning num_format syndrome
-        $index              = 164;
-        $numberFormatHashes = array();
-        $numberFormats      = array();
+        $hash_num_formats = array();
+        $num_formats      = array();
+        $index = 164;
 
         // Iterate through the XF objects and write a FORMAT record if it isn't a
         // built-in format type and if the FORMAT string hasn't already been used.
-        $total_formats = count($this->formats);
-
-        for ($i = 0; $i < $total_formats; ++$i) {
-            $numberFormat = $this->formats[$i]->_num_format;
+        $total_formats = count($this->_formats);
+        for ($i = 0; $i < $total_formats; $i++) {
+            $num_format = $this->_formats[$i]->_num_format;
 
             // Check if $num_format is an index to a built-in format.
             // Also check for a string of zeros, which is a valid format string
             // but would evaluate to zero.
             //
-            //@todo check if we can saftly replace >>"<< with >>'<<
-            if (!preg_match("/^0+\d/", $numberFormat)) {
-                if (preg_match("/^\d+$/", $numberFormat)) { // built-in format
+            if (!preg_match("/^0+\d/", $num_format)) {
+                if (preg_match("/^\d+$/", $num_format)) { // built-in format
                     continue;
                 }
             }
 
-            if (isset($numberFormatHashes[$numberFormat])) {
+            if (isset($hash_num_formats[$num_format])) {
                 // FORMAT has already been used
-                $this->formats[$i]->_num_format = $numberFormatHashes[$numberFormat];
+                $this->_formats[$i]->_num_format = $hash_num_formats[$num_format];
             } else{
                 // Add a new FORMAT
-                $numberFormatHashes[$numberFormat]    = $index;
-                $this->formats[$i]->_num_format     = $index;
-                array_push($numberFormats,$numberFormat);
-                ++$index;
+                $hash_num_formats[$num_format]  = $index;
+                $this->_formats[$i]->_num_format = $index;
+                array_push($num_formats,$num_format);
+                $index++;
             }
         }
 
         // Write the new FORMAT records starting from 0xA4
         $index = 164;
-        foreach ($numberFormats as $numberFormat) {
-            $this->storeNumFormat($numberFormat,$index);
-            ++$index;
+        foreach ($num_formats as $num_format) {
+            $this->_storeNumFormat($num_format,$index);
+            $index++;
         }
     }
 
@@ -800,26 +743,25 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    public function storeAllXfs()
+    function _storeAllXfs()
     {
-        // temporaryFormat is added by the constructor. We use this to write the default XF's
+        // _tmp_format is added by the constructor. We use this to write the default XF's
         // The default font index is 0
         //
-        $format = $this->temporaryFormat;
-
-        for ($i = 0; $i <= 14; ++$i) {
+        $format = $this->_tmp_format;
+        for ($i = 0; $i <= 14; $i++) {
             $xf = $format->getXf('style'); // Style XF
-            $this->append($xf);
+            $this->_append($xf);
         }
 
         $xf = $format->getXf('cell');      // Cell XF
-        $this->append($xf);
+        $this->_append($xf);
 
         // User defined XFs
-        $total_formats = count($this->formats);
-        for ($i = 0; $i < $total_formats; ++$i) {
-            $xf = $this->formats[$i]->getXf('cell');
-            $this->append($xf);
+        $total_formats = count($this->_formats);
+        for ($i = 0; $i < $total_formats; $i++) {
+            $xf = $this->_formats[$i]->getXf('cell');
+            $this->_append($xf);
         }
     }
 
@@ -828,9 +770,9 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function storeAllStyles()
+    function _storeAllStyles()
     {
-        $this->storeStyle();
+        $this->_storeStyle();
     }
 
     /**
@@ -839,14 +781,15 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function storeExterns()
+    function _storeExterns()
+
     {
         // Create EXTERNCOUNT with number of worksheets
-        $this->storeExterncount(count($this->workSheet));
+        $this->_storeExterncount(count($this->_worksheets));
 
         // Create EXTERNSHEET for each worksheet
-        foreach ($this->sheetNames as $sheetname) {
-            $this->storeExternsheet($sheetname);
+        foreach ($this->_sheetnames as $sheetname) {
+            $this->_storeExternsheet($sheetname);
         }
     }
 
@@ -855,33 +798,31 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function storeNames()
+    function _storeNames()
     {
         // Create the print area NAME records
-        $total_worksheets = count($this->workSheet);
-
-        for ($i = 0; $i < $total_worksheets; ++$i) {
+        $total_worksheets = count($this->_worksheets);
+        for ($i = 0; $i < $total_worksheets; $i++) {
             // Write a Name record if the print area has been defined
-            if (isset($this->workSheet[$i]->print_rowmin)) {
-                $this->storeNameShort(
-                    $this->workSheet[$i]->index,
+            if (isset($this->_worksheets[$i]->print_rowmin)) {
+                $this->_storeNameShort(
+                    $this->_worksheets[$i]->index,
                     0x06, // NAME type
-                    $this->workSheet[$i]->print_rowmin,
-                    $this->workSheet[$i]->print_rowmax,
-                    $this->workSheet[$i]->print_colmin,
-                    $this->workSheet[$i]->print_colmax
+                    $this->_worksheets[$i]->print_rowmin,
+                    $this->_worksheets[$i]->print_rowmax,
+                    $this->_worksheets[$i]->print_colmin,
+                    $this->_worksheets[$i]->print_colmax
                     );
             }
         }
 
         // Create the print title NAME records
-        $total_worksheets = count($this->workSheet);
-
-        for ($i = 0; $i < $total_worksheets; ++$i) {
-            $rowmin = $this->workSheet[$i]->title_rowmin;
-            $rowmax = $this->workSheet[$i]->title_rowmax;
-            $colmin = $this->workSheet[$i]->title_colmin;
-            $colmax = $this->workSheet[$i]->title_colmax;
+        $total_worksheets = count($this->_worksheets);
+        for ($i = 0; $i < $total_worksheets; $i++) {
+            $rowmin = $this->_worksheets[$i]->title_rowmin;
+            $rowmax = $this->_worksheets[$i]->title_rowmax;
+            $colmin = $this->_worksheets[$i]->title_colmin;
+            $colmax = $this->_worksheets[$i]->title_colmax;
 
             // Determine if row + col, row, col or nothing has been defined
             // and write the appropriate record
@@ -889,8 +830,8 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
             if (isset($rowmin) && isset($colmin)) {
                 // Row and column titles have been defined.
                 // Row title has been defined.
-                $this->storeNameLong(
-                    $this->workSheet[$i]->index,
+                $this->_storeNameLong(
+                    $this->_worksheets[$i]->index,
                     0x07, // NAME type
                     $rowmin,
                     $rowmax,
@@ -899,8 +840,8 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
                     );
             } elseif (isset($rowmin)) {
                 // Row title has been defined.
-                $this->storeNameShort(
-                    $this->workSheet[$i]->index,
+                $this->_storeNameShort(
+                    $this->_worksheets[$i]->index,
                     0x07, // NAME type
                     $rowmin,
                     $rowmax,
@@ -909,8 +850,8 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
                     );
             } elseif (isset($colmin)) {
                 // Column title has been defined.
-                $this->storeNameShort(
-                    $this->workSheet[$i]->index,
+                $this->_storeNameShort(
+                    $this->_worksheets[$i]->index,
                     0x07, // NAME type
                     0x0000,
                     0x3fff,
@@ -937,16 +878,16 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function storeCodepage()
+    function _storeCodepage()
     {
         $record          = 0x0042;             // Record identifier
         $length          = 0x0002;             // Number of bytes to follow
-        $cv              = $this->codePage;   // The code page
+        $cv              = $this->_codepage;   // The code page
 
         $header          = pack('vv', $record, $length);
         $data            = pack('v',  $cv);
 
-        $this->append($header . $data);
+        $this->_append($header . $data);
     }
 
     /**
@@ -954,7 +895,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function storeWindow1()
+    function _storeWindow1()
     {
         $record    = 0x003D;                 // Record identifier
         $length    = 0x0012;                 // Number of bytes to follow
@@ -965,55 +906,51 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
         $dyWn      = 0x1572;                 // Height of window
 
         $grbit     = 0x0038;                 // Option flags
-        $ctabsel   = $this->selectedWorkBook;       // Number of workbook tabs selected
+        $ctabsel   = $this->_selected;       // Number of workbook tabs selected
         $wTabRatio = 0x0258;                 // Tab to scrollbar ratio
 
-        $itabFirst = $this->firstSheet;     // 1st displayed worksheet
-        $itabCur   = $this->activeSheet;    // Active worksheet
+        $itabFirst = $this->_firstsheet;     // 1st displayed worksheet
+        $itabCur   = $this->_activesheet;    // Active worksheet
 
-        $header    = pack('vv', $record, $length);
-        $data      = pack('vvvvvvvvv', $xWn, $yWn, $dxWn, $dyWn,
+        $header    = pack("vv",        $record, $length);
+        $data      = pack("vvvvvvvvv", $xWn, $yWn, $dxWn, $dyWn,
                                        $grbit,
                                        $itabCur, $itabFirst,
                                        $ctabsel, $wTabRatio);
-        $this->append($header . $data);
+        $this->_append($header . $data);
     }
 
     /**
     * Writes Excel BIFF BOUNDSHEET record.
     * FIXME: inconsistent with BIFF documentation
     *
-    * @param string  $sheetName Worksheet name
+    * @param string  $sheetname Worksheet name
     * @param integer $offset    Location of worksheet BOF
     * @access private
     */
-    protected function storeBoundsheet($sheetName, $offset)
+    function _storeBoundsheet($sheetname,$offset)
     {
-        $record = 0x0085;                    // Record identifier
-
-        if ($this->BIFF_version == 0x0600) {
-            $length = 0x08 + strlen($sheetName); // Number of bytes to follow
+        $record    = 0x0085;                    // Record identifier
+        if ($this->_BIFF_version == 0x0600) {
+            $length    = 0x08 + strlen($sheetname); // Number of bytes to follow
         } else {
-            $length = 0x07 + strlen($sheetName); // Number of bytes to follow
+            $length = 0x07 + strlen($sheetname); // Number of bytes to follow
         }
 
-        $grbit = 0x0000;                    // Visibility and sheet type
-
-        if ($this->BIFF_version == 0x0600) {
-            $cch       = mb_strlen($sheetName,'UTF-16LE'); // Length of sheet name
+        $grbit     = 0x0000;                    // Visibility and sheet type
+        if ($this->_BIFF_version == 0x0600) {
+            $cch       = mb_strlen($sheetname,'UTF-16LE'); // Length of sheet name
         } else {
-            $cch       = strlen($sheetName);        // Length of sheet name
+            $cch       = strlen($sheetname);        // Length of sheet name
         }
 
-        $header = pack('vv',  $record, $length);
-
-        if ($this->BIFF_version == 0x0600) {
-            $data      = pack('VvCC', $offset, $grbit, $cch, 0x1);
+        $header    = pack("vv",  $record, $length);
+        if ($this->_BIFF_version == 0x0600) {
+            $data      = pack("VvCC", $offset, $grbit, $cch, 0x1);
         } else {
-            $data      = pack('VvC', $offset, $grbit, $cch);
+            $data      = pack("VvC", $offset, $grbit, $cch);
         }
-
-        $this->append($header . $data . $sheetName);
+        $this->_append($header.$data.$sheetname);
     }
 
     /**
@@ -1021,14 +958,14 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function storeSupbookInternal()
+    function _storeSupbookInternal()
     {
         $record    = 0x01AE;   // Record identifier
         $length    = 0x0004;   // Bytes to follow
 
-        $header    = pack('vv', $record, $length);
-        $data      = pack('vv', count($this->workSheet), 0x0104);
-        $this->append($header . $data);
+        $header    = pack("vv", $record, $length);
+        $data      = pack("vv", count($this->_worksheets), 0x0104);
+        $this->_append($header . $data);
     }
 
     /**
@@ -1038,19 +975,19 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     * @param string $sheetname Worksheet name
     * @access private
     */
-    protected function storeExternsheetBiff8()
+    function _storeExternsheetBiff8()
     {
-        $total_references = count($this->parser->_references);
-        $record = 0x0017;                     // Record identifier
-        $length = 2 + 6 * $total_references;  // Number of bytes to follow
-        $header = pack('vv',  $record, $length);
-        $data   = pack('v', $total_references);
+        $total_references = count($this->_parser->_references);
+        $record   = 0x0017;                     // Record identifier
+        $length   = 2 + 6 * $total_references;  // Number of bytes to follow
 
-        for ($i = 0; $i < $total_references; ++$i) {
-            $data .= $this->parser->_references[$i];
+        $supbook_index = 0;           // FIXME: only using internal SUPBOOK record
+        $header           = pack("vv",  $record, $length);
+        $data             = pack('v', $total_references);
+        for ($i = 0; $i < $total_references; $i++) {
+            $data .= $this->_parser->_references[$i];
         }
-
-        $this->append($header . $data);
+        $this->_append($header . $data);
     }
 
     /**
@@ -1058,7 +995,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function storeStyle()
+    function _storeStyle()
     {
         $record    = 0x0293;   // Record identifier
         $length    = 0x0004;   // Bytes to follow
@@ -1067,9 +1004,9 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
         $BuiltIn   = 0x00;     // Built-in style
         $iLevel    = 0xff;     // Outline style level
 
-        $header    = pack('vv',  $record, $length);
-        $data      = pack('vCC', $ixfe, $BuiltIn, $iLevel);
-        $this->append($header . $data);
+        $header    = pack("vv",  $record, $length);
+        $data      = pack("vCC", $ixfe, $BuiltIn, $iLevel);
+        $this->_append($header . $data);
     }
 
 
@@ -1080,18 +1017,18 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     * @param integer $ifmt   Format index code
     * @access private
     */
-    protected function storeNumFormat($format, $ifmt)
+    function _storeNumFormat($format, $ifmt)
     {
         $record    = 0x041E;                      // Record identifier
 
-        if ($this->BIFF_version == 0x0600) {
+        if ($this->_BIFF_version == 0x0600) {
             $length    = 5 + strlen($format);      // Number of bytes to follow
             $encoding = 0x0;
-        } elseif ($this->BIFF_version == 0x0500) {
+        } elseif ($this->_BIFF_version == 0x0500) {
             $length    = 3 + strlen($format);      // Number of bytes to follow
         }
 
-        if ( $this->BIFF_version == 0x0600 && function_exists('iconv') ) {     // Encode format String
+        if ( $this->_BIFF_version == 0x0600 && function_exists('iconv') ) {     // Encode format String
             if (mb_detect_encoding($format, 'auto') !== 'UTF-16LE'){
                 $format = iconv(mb_detect_encoding($format, 'auto'),'UTF-16LE',$format);
             }
@@ -1103,14 +1040,14 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
         }
         $length = strlen($format);
 
-        if ($this->BIFF_version == 0x0600) {
-            $header    = pack('vv', $record, 5 + $length);
-            $data      = pack('vvC', $ifmt, $cch, $encoding);
-        } elseif ($this->BIFF_version == 0x0500) {
-            $header    = pack('vv', $record, 3 + $length);
-            $data      = pack('vC', $ifmt, $cch);
+        if ($this->_BIFF_version == 0x0600) {
+            $header    = pack("vv", $record, 5 + $length);
+            $data      = pack("vvC", $ifmt, $cch, $encoding);
+        } elseif ($this->_BIFF_version == 0x0500) {
+            $header    = pack("vv", $record, 3 + $length);
+            $data      = pack("vC", $ifmt, $cch);
         }
-        $this->append($header . $data . $format);
+        $this->_append($header . $data . $format);
     }
 
     /**
@@ -1118,16 +1055,16 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function storeDatemode()
+    function _storeDatemode()
     {
         $record    = 0x0022;         // Record identifier
         $length    = 0x0002;         // Bytes to follow
 
-        $f1904     = $this->flagFor1904;   // Flag for 1904 date system
+        $f1904     = $this->_1904;   // Flag for 1904 date system
 
-        $header    = pack('vv', $record, $length);
-        $data      = pack('v', $f1904);
-        $this->append($header . $data);
+        $header    = pack("vv", $record, $length);
+        $data      = pack("v", $f1904);
+        $this->_append($header . $data);
     }
 
 
@@ -1144,14 +1081,14 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     * @param integer $cxals Number of external references
     * @access private
     */
-    protected function storeExterncount($cxals)
+    function _storeExterncount($cxals)
     {
         $record   = 0x0016;          // Record identifier
         $length   = 0x0002;          // Number of bytes to follow
 
-        $header   = pack('vv', $record, $length);
-        $data     = pack('v',  $cxals);
-        $this->append($header . $data);
+        $header   = pack("vv", $record, $length);
+        $data     = pack("v",  $cxals);
+        $this->_append($header . $data);
     }
 
 
@@ -1162,20 +1099,20 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * A similar method is used in Worksheet.php for a slightly different purpose.
     *
-    * @param string $sheetName Worksheet name
+    * @param string $sheetname Worksheet name
     * @access private
     */
-    protected function storeExternsheet($sheetName)
+    function _storeExternsheet($sheetname)
     {
         $record      = 0x0017;                     // Record identifier
-        $length      = 0x02 + strlen($sheetName);  // Number of bytes to follow
+        $length      = 0x02 + strlen($sheetname);  // Number of bytes to follow
 
-        $cch         = strlen($sheetName);         // Length of sheet name
+        $cch         = strlen($sheetname);         // Length of sheet name
         $rgch        = 0x03;                       // Filename encoding
 
-        $header      = pack('vv',  $record, $length);
-        $data        = pack('CC', $cch, $rgch);
-        $this->append($header . $data . $sheetName);
+        $header      = pack("vv",  $record, $length);
+        $data        = pack("CC", $cch, $rgch);
+        $this->_append($header . $data . $sheetname);
     }
 
 
@@ -1191,7 +1128,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     * @param integer $colmax End column
     * @access private
     */
-    protected function storeNameShort($index, $type, $rowmin, $rowmax, $colmin, $colmax)
+    function _storeNameShort($index, $type, $rowmin, $rowmax, $colmin, $colmax)
     {
         $record          = 0x0018;       // Record identifier
         $length          = 0x0024;       // Number of bytes to follow
@@ -1215,38 +1152,38 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
         $unknown07       = 0x1087;
         $unknown08       = 0x8005;
 
-        $header             = pack('vv', $record, $length);
-        $data               = pack('v', $grbit);
-        $data              .= pack('C', $chKey);
-        $data              .= pack('C', $cch);
-        $data              .= pack('v', $cce);
-        $data              .= pack('v', $ixals);
-        $data              .= pack('v', $itab);
-        $data              .= pack('C', $cchCustMenu);
-        $data              .= pack('C', $cchDescription);
-        $data              .= pack('C', $cchHelptopic);
-        $data              .= pack('C', $cchStatustext);
-        $data              .= pack('C', $rgch);
-        $data              .= pack('C', $unknown03);
-        $data              .= pack('v', $unknown04);
-        $data              .= pack('v', $unknown05);
-        $data              .= pack('v', $unknown06);
-        $data              .= pack('v', $unknown07);
-        $data              .= pack('v', $unknown08);
-        $data              .= pack('v', $index);
-        $data              .= pack('v', $index);
-        $data              .= pack('v', $rowmin);
-        $data              .= pack('v', $rowmax);
-        $data              .= pack('C', $colmin);
-        $data              .= pack('C', $colmax);
-        $this->append($header . $data);
+        $header             = pack("vv", $record, $length);
+        $data               = pack("v", $grbit);
+        $data              .= pack("C", $chKey);
+        $data              .= pack("C", $cch);
+        $data              .= pack("v", $cce);
+        $data              .= pack("v", $ixals);
+        $data              .= pack("v", $itab);
+        $data              .= pack("C", $cchCustMenu);
+        $data              .= pack("C", $cchDescription);
+        $data              .= pack("C", $cchHelptopic);
+        $data              .= pack("C", $cchStatustext);
+        $data              .= pack("C", $rgch);
+        $data              .= pack("C", $unknown03);
+        $data              .= pack("v", $unknown04);
+        $data              .= pack("v", $unknown05);
+        $data              .= pack("v", $unknown06);
+        $data              .= pack("v", $unknown07);
+        $data              .= pack("v", $unknown08);
+        $data              .= pack("v", $index);
+        $data              .= pack("v", $index);
+        $data              .= pack("v", $rowmin);
+        $data              .= pack("v", $rowmax);
+        $data              .= pack("C", $colmin);
+        $data              .= pack("C", $colmax);
+        $this->_append($header . $data);
     }
 
 
     /**
     * Store the NAME record in the long format that is used for storing the repeat
     * rows and columns when both are specified. This shares a lot of code with
-    * storeNameShort() but we use a separate method to keep the code clean.
+    * _storeNameShort() but we use a separate method to keep the code clean.
     * Code abstraction for reuse can be carried too far, and I should know. ;-)
     *
     * @param integer $index Sheet index
@@ -1257,7 +1194,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     * @param integer $colmax End column
     * @access private
     */
-    protected function storeNameLong($index, $type, $rowmin, $rowmax, $colmin, $colmax)
+    function _storeNameLong($index, $type, $rowmin, $rowmax, $colmin, $colmax)
     {
         $record          = 0x0018;       // Record identifier
         $length          = 0x003d;       // Number of bytes to follow
@@ -1282,49 +1219,49 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
         $unknown07       = 0x1087;
         $unknown08       = 0x8008;
 
-        $header             = pack('vv',  $record, $length);
-        $data               = pack('v', $grbit);
-        $data              .= pack('C', $chKey);
-        $data              .= pack('C', $cch);
-        $data              .= pack('v', $cce);
-        $data              .= pack('v', $ixals);
-        $data              .= pack('v', $itab);
-        $data              .= pack('C', $cchCustMenu);
-        $data              .= pack('C', $cchDescription);
-        $data              .= pack('C', $cchHelptopic);
-        $data              .= pack('C', $cchStatustext);
-        $data              .= pack('C', $rgch);
-        $data              .= pack('C', $unknown01);
-        $data              .= pack('v', $unknown02);
+        $header             = pack("vv",  $record, $length);
+        $data               = pack("v", $grbit);
+        $data              .= pack("C", $chKey);
+        $data              .= pack("C", $cch);
+        $data              .= pack("v", $cce);
+        $data              .= pack("v", $ixals);
+        $data              .= pack("v", $itab);
+        $data              .= pack("C", $cchCustMenu);
+        $data              .= pack("C", $cchDescription);
+        $data              .= pack("C", $cchHelptopic);
+        $data              .= pack("C", $cchStatustext);
+        $data              .= pack("C", $rgch);
+        $data              .= pack("C", $unknown01);
+        $data              .= pack("v", $unknown02);
         // Column definition
-        $data              .= pack('C', $unknown03);
-        $data              .= pack('v', $unknown04);
-        $data              .= pack('v', $unknown05);
-        $data              .= pack('v', $unknown06);
-        $data              .= pack('v', $unknown07);
-        $data              .= pack('v', $unknown08);
-        $data              .= pack('v', $index);
-        $data              .= pack('v', $index);
-        $data              .= pack('v', 0x0000);
-        $data              .= pack('v', 0x3fff);
-        $data              .= pack('C', $colmin);
-        $data              .= pack('C', $colmax);
+        $data              .= pack("C", $unknown03);
+        $data              .= pack("v", $unknown04);
+        $data              .= pack("v", $unknown05);
+        $data              .= pack("v", $unknown06);
+        $data              .= pack("v", $unknown07);
+        $data              .= pack("v", $unknown08);
+        $data              .= pack("v", $index);
+        $data              .= pack("v", $index);
+        $data              .= pack("v", 0x0000);
+        $data              .= pack("v", 0x3fff);
+        $data              .= pack("C", $colmin);
+        $data              .= pack("C", $colmax);
         // Row definition
-        $data              .= pack('C', $unknown03);
-        $data              .= pack('v', $unknown04);
-        $data              .= pack('v', $unknown05);
-        $data              .= pack('v', $unknown06);
-        $data              .= pack('v', $unknown07);
-        $data              .= pack('v', $unknown08);
-        $data              .= pack('v', $index);
-        $data              .= pack('v', $index);
-        $data              .= pack('v', $rowmin);
-        $data              .= pack('v', $rowmax);
-        $data              .= pack('C', 0x00);
-        $data              .= pack('C', 0xff);
+        $data              .= pack("C", $unknown03);
+        $data              .= pack("v", $unknown04);
+        $data              .= pack("v", $unknown05);
+        $data              .= pack("v", $unknown06);
+        $data              .= pack("v", $unknown07);
+        $data              .= pack("v", $unknown08);
+        $data              .= pack("v", $index);
+        $data              .= pack("v", $index);
+        $data              .= pack("v", $rowmin);
+        $data              .= pack("v", $rowmax);
+        $data              .= pack("C", 0x00);
+        $data              .= pack("C", 0xff);
         // End of data
-        $data              .= pack('C', 0x10);
-        $this->append($header . $data);
+        $data              .= pack("C", 0x10);
+        $this->_append($header . $data);
     }
 
     /**
@@ -1332,15 +1269,15 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function storeCountry()
+    function _storeCountry()
     {
         $record          = 0x008C;    // Record identifier
         $length          = 4;         // Number of bytes to follow
 
         $header = pack('vv',  $record, $length);
         /* using the same country code always for simplicity */
-        $data = pack('vv', $this->countryCode, $this->countryCode);
-        $this->append($header . $data);
+        $data = pack('vv', $this->_country_code, $this->_country_code);
+        $this->_append($header . $data);
     }
 
     /**
@@ -1348,9 +1285,9 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function storePalette()
+    function _storePalette()
     {
-        $aref            = $this->palette;
+        $aref            = $this->_palette;
 
         $record          = 0x0092;                 // Record identifier
         $length          = 2 + 4 * count($aref);   // Number of bytes to follow
@@ -1360,12 +1297,12 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
         // Pack the RGB data
         foreach ($aref as $color) {
             foreach ($color as $byte) {
-                $data .= pack('C', $byte);
+                $data .= pack("C",$byte);
             }
         }
 
-        $header = pack('vvv',  $record, $length, $ccv);
-        $this->append($header . $data);
+        $header = pack("vvv",  $record, $length, $ccv);
+        $this->_append($header . $data);
     }
 
     /**
@@ -1378,7 +1315,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function calculateSharedStringsSizes()
+    function _calculateSharedStringsSizes()
     {
         /* Iterate through the strings to calculate the CONTINUE block sizes.
            For simplicity we use the same size for the SST and CONTINUE records:
@@ -1390,13 +1327,13 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
         $continue_limit     = 8208;
         $block_length       = 0;
         $written            = 0;
-        $this->blockSize = array();
+        $this->_block_sizes = array();
         $continue           = 0;
 
-        foreach (array_keys($this->tableOfStrings) as $string) {
+        foreach (array_keys($this->_str_table) as $string) {
             $string_length = strlen($string);
-            $headerinfo    = unpack('vlength/Cencoding', $string);
-            $encoding      = $headerinfo['encoding'];
+            $headerinfo    = unpack("vlength/Cencoding", $string);
+            $encoding      = $headerinfo["encoding"];
             $split_string  = 0;
 
             // Block length is the total length of the strings that will be
@@ -1456,7 +1393,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
                     $block_length -= $continue_limit - $continue - $align;
 
                     // Store the max size for this block
-                    $this->blockSize[] = $continue_limit - $align;
+                    $this->_block_sizes[] = $continue_limit - $align;
 
                     // If the current string was split then the next CONTINUE block
                     // should have the string continue flag (grbit) set unless the
@@ -1468,7 +1405,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
                     }
                 } else {
                     // Store the max size for this block
-                    $this->blockSize[] = $written + $continue;
+                    $this->_block_sizes[] = $written + $continue;
 
                     // Not enough space to start the string in the current block
                     $block_length -= $continue_limit - $space_remaining - $continue;
@@ -1489,7 +1426,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
 
         // Store the max size for the last block unless it is empty
         if ($written + $continue) {
-            $this->blockSize[] = $written + $continue;
+            $this->_block_sizes[] = $written + $continue;
         }
 
 
@@ -1499,13 +1436,13 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
          they must be written before the SST records
         */
 
-        $tmp_block_sizes    = $this->blockSize;
-        $length             = 12;
+        $tmp_block_sizes = array();
+        $tmp_block_sizes = $this->_block_sizes;
 
+        $length  = 12;
         if (!empty($tmp_block_sizes)) {
             $length += array_shift($tmp_block_sizes); // SST
         }
-
         while (!empty($tmp_block_sizes)) {
             $length += 4 + array_shift($tmp_block_sizes); // CONTINUEs
         }
@@ -1524,7 +1461,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     *
     * @access private
     */
-    protected function storeSharedStringsTable()
+    function _storeSharedStringsTable()
     {
         $record  = 0x00fc;  // Record identifier
         $length  = 0x0008;  // Number of bytes to follow
@@ -1537,8 +1474,8 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
         $continue       = 0;
 
         // sizes are upside down
-        $tmp_block_sizes = $this->blockSize;
-        // $tmp_block_sizes = array_reverse($this->blockSize);
+        $tmp_block_sizes = $this->_block_sizes;
+        // $tmp_block_sizes = array_reverse($this->_block_sizes);
 
         // The SST record is required even if it contains no strings. Thus we will
         // always have a length
@@ -1554,19 +1491,19 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
 
 
         // Write the SST block header information
-        $header      = pack('vv', $record, $length);
-        $data        = pack('VV', $this->totalStringLength, $this->uniqueString);
-        $this->append($header . $data);
+        $header      = pack("vv", $record, $length);
+        $data        = pack("VV", $this->_str_total, $this->_str_unique);
+        $this->_append($header . $data);
 
 
 
 
         /* TODO: not good for performance */
-        foreach (array_keys($this->tableOfStrings) as $string) {
+        foreach (array_keys($this->_str_table) as $string) {
 
             $string_length = strlen($string);
-            $headerinfo    = unpack('vlength/Cencoding', $string);
-            $encoding      = $headerinfo['encoding'];
+            $headerinfo    = unpack("vlength/Cencoding", $string);
+            $encoding      = $headerinfo["encoding"];
             $split_string  = 0;
 
             // Block length is the total length of the strings that will be
@@ -1577,7 +1514,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
 
             // We can write the string if it doesn't cross a CONTINUE boundary
             if ($block_length < $continue_limit) {
-                $this->append($string);
+                $this->_append($string);
                 $written += $string_length;
                 continue;
             }
@@ -1625,7 +1562,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
                 if ($space_remaining > $header_length) {
                     // Write as much as possible of the string in the current block
                     $tmp = substr($string, 0, $space_remaining);
-                    $this->append($tmp);
+                    $this->_append($tmp);
 
                     // The remainder will be written in the next block(s)
                     $string = substr($string, $space_remaining);
@@ -1649,7 +1586,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
                 }
 
                 // Write the CONTINUE block header
-                if (!empty($this->blockSize)) {
+                if (!empty($this->_block_sizes)) {
                     $record  = 0x003C;
                     $length  = array_shift($tmp_block_sizes);
 
@@ -1657,7 +1594,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
                     if ($continue) {
                         $header .= pack('C', $encoding);
                     }
-                    $this->append($header);
+                    $this->_append($header);
                 }
 
                 // If the string (or substr) is small enough we can write it in the
@@ -1665,7 +1602,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
                 // one or more CONTINUE blocks
                 //
                 if ($block_length < $continue_limit) {
-                    $this->append($string);
+                    $this->_append($string);
                     $written = $block_length;
                 } else {
                     $written = 0;
@@ -1673,5 +1610,7 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
             }
         }
     }
+
+
 }
 
diff --git a/Spreadsheet/Excel/Writer/Worksheet.php b/Spreadsheet/Excel/Writer/Worksheet.php
index b38fa71..2cbf9b0 100644
--- a/Spreadsheet/Excel/Writer/Worksheet.php
+++ b/Spreadsheet/Excel/Writer/Worksheet.php
@@ -32,8 +32,8 @@
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
-require_once __DIR__ . '/Parser.php';
-require_once __DIR__ . '/BIFFwriter.php';
+require_once 'Spreadsheet/Excel/Writer/Parser.php';
+require_once 'Spreadsheet/Excel/Writer/BIFFwriter.php';
 
 /**
 * Class for generating Excel Spreadsheets
@@ -49,375 +49,364 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * Name of the Worksheet
     * @var string
     */
-    public $name;
+    var $name;
 
     /**
     * Index for the Worksheet
     * @var integer
     */
-    public $index;
+    var $index;
 
     /**
     * Reference to the (default) Format object for URLs
-    * @var Spreadsheet_Excel_Writer_Format
+    * @var object Format
     */
-    public $_url_format;
+    var $_url_format;
 
     /**
     * Reference to the parser used for parsing formulas
-    * @var Spreadsheet_Excel_Writer_Format
+    * @var object Format
     */
-    public $_parser;
+    var $_parser;
 
     /**
     * Filehandle to the temporary file for storing data
     * @var resource
     */
-    public $_filehandle;
+    var $_filehandle;
 
     /**
     * Boolean indicating if we are using a temporary file for storing data
     * @var bool
     */
-    public $_using_tmpfile;
+    var $_using_tmpfile;
 
     /**
     * Maximum number of rows for an Excel spreadsheet (BIFF5)
     * @var integer
     */
-    public $_xls_rowmax;
+    var $_xls_rowmax;
 
     /**
     * Maximum number of columns for an Excel spreadsheet (BIFF5)
     * @var integer
     */
-    public $_xls_colmax;
+    var $_xls_colmax;
 
     /**
     * Maximum number of characters for a string (LABEL record in BIFF5)
     * @var integer
     */
-    public $_xls_strmax;
+    var $_xls_strmax;
 
     /**
     * First row for the DIMENSIONS record
     * @var integer
     * @see _storeDimensions()
     */
-    public $_dim_rowmin;
+    var $_dim_rowmin;
 
     /**
     * Last row for the DIMENSIONS record
     * @var integer
     * @see _storeDimensions()
     */
-    public $_dim_rowmax;
+    var $_dim_rowmax;
 
     /**
     * First column for the DIMENSIONS record
     * @var integer
     * @see _storeDimensions()
     */
-    public $_dim_colmin;
+    var $_dim_colmin;
 
     /**
     * Last column for the DIMENSIONS record
     * @var integer
     * @see _storeDimensions()
     */
-    public $_dim_colmax;
+    var $_dim_colmax;
 
     /**
     * Array containing format information for columns
     * @var array
     */
-    public $_colinfo;
+    var $_colinfo;
 
     /**
     * Array containing the selected area for the worksheet
     * @var array
     */
-    public $_selection;
+    var $_selection;
 
     /**
     * Array containing the panes for the worksheet
     * @var array
     */
-    public $_panes;
+    var $_panes;
 
     /**
     * The active pane for the worksheet
     * @var integer
     */
-    public $_active_pane;
+    var $_active_pane;
 
     /**
     * Bit specifying if panes are frozen
     * @var integer
     */
-    public $_frozen;
+    var $_frozen;
 
     /**
     * Bit specifying if the worksheet is selected
     * @var integer
     */
-    public $selected;
+    var $selected;
 
     /**
     * The paper size (for printing) (DOCUMENT!!!)
     * @var integer
     */
-    public $_paper_size;
+    var $_paper_size;
 
     /**
     * Bit specifying paper orientation (for printing). 0 => landscape, 1 => portrait
     * @var integer
     */
-    public $_orientation;
+    var $_orientation;
 
     /**
     * The page header caption
     * @var string
     */
-    public $_header;
+    var $_header;
 
     /**
     * The page footer caption
     * @var string
     */
-    public $_footer;
+    var $_footer;
 
     /**
     * The horizontal centering value for the page
     * @var integer
     */
-    public $_hcenter;
+    var $_hcenter;
 
     /**
     * The vertical centering value for the page
     * @var integer
     */
-    public $_vcenter;
+    var $_vcenter;
 
     /**
     * The margin for the header
     * @var float
     */
-    public $_margin_head;
+    var $_margin_head;
 
     /**
     * The margin for the footer
     * @var float
     */
-    public $_margin_foot;
+    var $_margin_foot;
 
     /**
     * The left margin for the worksheet in inches
     * @var float
     */
-    public $_margin_left;
+    var $_margin_left;
 
     /**
     * The right margin for the worksheet in inches
     * @var float
     */
-    public $_margin_right;
+    var $_margin_right;
 
     /**
     * The top margin for the worksheet in inches
     * @var float
     */
-    public $_margin_top;
+    var $_margin_top;
 
     /**
     * The bottom margin for the worksheet in inches
     * @var float
     */
-    public $_margin_bottom;
+    var $_margin_bottom;
 
     /**
     * First row to reapeat on each printed page
     * @var integer
     */
-    public $title_rowmin;
+    var $title_rowmin;
 
     /**
     * Last row to reapeat on each printed page
     * @var integer
     */
-    public $title_rowmax;
+    var $title_rowmax;
 
     /**
     * First column to reapeat on each printed page
     * @var integer
     */
-    public $title_colmin;
+    var $title_colmin;
 
     /**
     * First row of the area to print
     * @var integer
     */
-    public $print_rowmin;
+    var $print_rowmin;
 
     /**
     * Last row to of the area to print
     * @var integer
     */
-    public $print_rowmax;
+    var $print_rowmax;
 
     /**
     * First column of the area to print
     * @var integer
     */
-    public $print_colmin;
+    var $print_colmin;
 
     /**
     * Last column of the area to print
     * @var integer
     */
-    public $print_colmax;
+    var $print_colmax;
 
     /**
     * Whether to display RightToLeft.
     * @var integer
     */
-    public $_Arabic;
+    var $_Arabic;
 
     /**
     * Whether to use outline.
     * @var integer
     */
-    public $_outline_on;
+    var $_outline_on;
 
     /**
     * Auto outline styles.
     * @var bool
     */
-    public $_outline_style;
+    var $_outline_style;
 
     /**
     * Whether to have outline summary below.
     * @var bool
     */
-    public $_outline_below;
+    var $_outline_below;
 
     /**
     * Whether to have outline summary at the right.
     * @var bool
     */
-    public $_outline_right;
+    var $_outline_right;
 
     /**
     * Outline row level.
     * @var integer
     */
-    public $_outline_row_level;
+    var $_outline_row_level;
 
     /**
     * Whether to fit to page when printing or not.
     * @var bool
     */
-    public $_fit_page;
+    var $_fit_page;
 
     /**
     * Number of pages to fit wide
     * @var integer
     */
-    public $_fit_width;
+    var $_fit_width;
 
     /**
     * Number of pages to fit high
     * @var integer
     */
-    public $_fit_height;
+    var $_fit_height;
 
     /**
     * Reference to the total number of strings in the workbook
     * @var integer
     */
-    public $_str_total;
+    var $_str_total;
 
     /**
     * Reference to the number of unique strings in the workbook
     * @var integer
     */
-    public $_str_unique;
+    var $_str_unique;
 
     /**
     * Reference to the array containing all the unique strings in the workbook
     * @var array
     */
-    public $_str_table;
+    var $_str_table;
 
     /**
      * Number of merged cell ranges in actual record
      * @var int $_merged_cells_counter
      */
-    public $_merged_cells_counter = 0;
+    var $_merged_cells_counter = 0;
 
     /**
      * Number of actual mergedcells record
      * @var int $_merged_cells_record
      */
-    public $_merged_cells_record = 0;
+    var $_merged_cells_record = 0;
 
     /**
     * Merged cell ranges
     * @var array
     */
-    public $_merged_ranges;
+    var $_merged_ranges;
 
     /**
     * Charset encoding currently used when calling writeString()
     * @var string
     */
-    public $_input_encoding;
-
-    public $activesheet;
-
-    public $firstsheet;
+    var $_input_encoding;
 
     /**
     * Constructor
     *
     * @param string  $name         The name of the new worksheet
     * @param integer $index        The index of the new worksheet
-    * @param mixed   $activeSheet The current activesheet of the workbook we belong to
-    * @param mixed   $firstSheet  The first worksheet in the workbook we belong to
-    * @param mixed   $url_format  The default format for hyperlinks
-    * @param mixed   $parser      The formula parser created for the Workbook
+    * @param mixed   &$activesheet The current activesheet of the workbook we belong to
+    * @param mixed   &$firstsheet  The first worksheet in the workbook we belong to
+    * @param mixed   &$url_format  The default format for hyperlinks
+    * @param mixed   &$parser      The formula parser created for the Workbook
     * @param string  $tmp_dir      The path to the directory for temporary files
     * @access private
     */
-    public function __construct(
-        $BIFF_version,
-        $name,
-        $index,
-        $activeSheet,
-        $firstSheet,
-        $str_total,
-        $str_unique,
-        $str_table,
-        $url_format,
-        $parser,
-        $tmp_dir
-    )
+    function Spreadsheet_Excel_Writer_Worksheet($BIFF_version, $name,
+                                                $index, &$activesheet,
+                                                &$firstsheet, &$str_total,
+                                                &$str_unique, &$str_table,
+                                                &$url_format, &$parser,
+                                                $tmp_dir)
     {
         // It needs to call its parent's constructor explicitly
-        parent::__construct();
-        $this->BIFF_version   = $BIFF_version;
+        $this->Spreadsheet_Excel_Writer_BIFFwriter();
+        $this->_BIFF_version   = $BIFF_version;
         $rowmax                = 65536; // 16384 in Excel 5
         $colmax                = 256;
 
         $this->name            = $name;
         $this->index           = $index;
-        $this->activesheet     = $activeSheet;
-        $this->firstsheet      = $firstSheet;
-        $this->_str_total      = $str_total;
-        $this->_str_unique     = $str_unique;
-        $this->_str_table      = $str_table;
-        $this->_url_format     = $url_format;
-        $this->_parser         = $parser;
+        $this->activesheet     = &$activesheet;
+        $this->firstsheet      = &$firstsheet;
+        $this->_str_total      = &$str_total;
+        $this->_str_unique     = &$str_unique;
+        $this->_str_table      = &$str_table;
+        $this->_url_format     = &$url_format;
+        $this->_parser         = &$parser;
 
         //$this->ext_sheets      = array();
         $this->_filehandle     = '';
@@ -493,8 +482,8 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         $this->_dv                = array();
         
-        $this->temporaryDirectory     = $tmp_dir;
-        $this->temporaryFile          = '';
+        $this->_tmp_dir           = $tmp_dir;
+        $this->_tmp_file          = '';
 
         $this->_initialize();
     }
@@ -506,13 +495,13 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _initialize()
+    function _initialize()
     {
         if ($this->_using_tmpfile == false) {
             return;
         }
 
-        if ($this->temporaryDirectory === '' && ini_get('open_basedir') === true) {
+        if ($this->_tmp_dir === '' && ini_get('open_basedir') === true) {
             // open_basedir restriction in effect - store data in memory
             // ToDo: Let the error actually have an effect somewhere
             $this->_using_tmpfile = false;  
@@ -520,12 +509,12 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         }
 
         // Open tmp file for storing Worksheet data
-        if ($this->temporaryDirectory === '') {
+        if ($this->_tmp_dir === '') {
             $fh = tmpfile();
         } else {
             // For people with open base dir restriction
-            $this->temporaryFile = tempnam($this->temporaryDirectory, 'Spreadsheet_Excel_Writer');
-            $fh = @fopen($this->temporaryFile, 'w+b');
+            $this->_tmp_file = tempnam($this->_tmp_dir, "Spreadsheet_Excel_Writer");
+            $fh = @fopen($this->_tmp_file, "w+b");
         }
 
         if ($fh === false) {
@@ -546,7 +535,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param array $sheetnames The array of sheetnames from the Workbook this
     *                          worksheet belongs to
     */
-    public function close($sheetnames)
+    function close($sheetnames)
     {
         $num_sheets = count($sheetnames);
 
@@ -604,7 +593,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         $this->_storeGridset();
 
          //  Prepend GUTS
-        if ($this->BIFF_version == 0x0500) {
+        if ($this->_BIFF_version == 0x0500) {
             $this->_storeGuts();
         }
 
@@ -615,7 +604,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         $this->_storePrintHeaders();
 
         // Prepend EXTERNSHEET references
-        if ($this->BIFF_version == 0x0500) {
+        if ($this->_BIFF_version == 0x0500) {
             for ($i = $num_sheets; $i > 0; $i--) {
                 $sheetname = $sheetnames[$i-1];
                 $this->_storeExternsheet($sheetname);
@@ -623,7 +612,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         }
 
         // Prepend the EXTERNCOUNT of external references.
-        if ($this->BIFF_version == 0x0500) {
+        if ($this->_BIFF_version == 0x0500) {
             $this->_storeExterncount($num_sheets);
         }
 
@@ -637,7 +626,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         }
 
         // Prepend the BOF record
-        $this->storeBof(0x0010);
+        $this->_storeBof(0x0010);
 
         /*
         * End of prepend. Read upwards from here.
@@ -652,18 +641,18 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         $this->_storeSelection($this->_selection);
         $this->_storeMergedCells();
         /* TODO: add data validity */
-        /*if ($this->BIFF_version == 0x0600) {
+        /*if ($this->_BIFF_version == 0x0600) {
             $this->_storeDataValidity();
         }*/
-        $this->storeEof();
+        $this->_storeEof();
 
-        if ( $this->temporaryFile != '' ) {
+        if ( $this->_tmp_file != '' ) {
           if ( $this->_filehandle ) {
             fclose($this->_filehandle);
             $this->_filehandle = '';
           }
-          @unlink($this->temporaryFile);
-          $this->temporaryFile      = '';
+          @unlink($this->_tmp_file);
+          $this->_tmp_file      = '';
           $this->_using_tmpfile = true;
         }
     }
@@ -675,7 +664,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @return string The worksheet's name
     */
-    public function getName()
+    function getName()
     {
         return $this->name;
     }
@@ -686,14 +675,14 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @return string The data
     */
-    public function getData()
+    function getData()
     {
         $buffer = 4096;
 
         // Return data stored in memory
-        if (isset($this->data)) {
-            $tmp   = $this->data;
-            unset($this->data);
+        if (isset($this->_data)) {
+            $tmp   = $this->_data;
+            unset($this->_data);
             $fh    = $this->_filehandle;
             if ($this->_using_tmpfile) {
                 fseek($fh, 0);
@@ -720,13 +709,13 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param integer $last_row  Last row of the area to merge
     * @param integer $last_col  Last column of the area to merge
     */
-    public function setMerge($first_row, $first_col, $last_row, $last_col)
+    function setMerge($first_row, $first_col, $last_row, $last_col)
     {
         if (($last_row < $first_row) || ($last_col < $first_col)) {
             return;
         }
 
-        $max_record_ranges = floor(($this->limit - 6) / 8);
+        $max_record_ranges = floor(($this->_limit - 6) / 8);
         if($this->_merged_cells_counter >= $max_record_ranges)
           {
             $this->_merged_cells_record++;
@@ -745,7 +734,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access public
     */
-    public function select()
+    function select()
     {
         $this->selected = 1;
     }
@@ -757,7 +746,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access public
     */
-    public function activate()
+    function activate()
     {
         $this->selected = 1;
         $this->activesheet = $this->index;
@@ -770,7 +759,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access public
     */
-    public function setFirstSheet()
+    function setFirstSheet()
     {
         $this->firstsheet = $this->index;
     }
@@ -783,7 +772,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param string $password The password to use for protecting the sheet.
     */
-    public function protect($password)
+    function protect($password)
     {
         $this->_protect   = 1;
         $this->_password  = $this->_encodePassword($password);
@@ -800,7 +789,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param integer $hidden   The optional hidden atribute
     * @param integer $level    The optional outline level
     */
-    public function setColumn($firstcol, $lastcol, $width, $format = null, $hidden = 0, $level = 0)
+    function setColumn($firstcol, $lastcol, $width, $format = null, $hidden = 0, $level = 0) 
     { // added by Dan Lynn <dan@spiderweblabs.com) on 2006-12-06 
         // look for any ranges this might overlap and remove, size or split where necessary 
         foreach ($this->_colinfo as $key => $colinfo) 
@@ -845,7 +834,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param integer $last_row     last row in the selected quadrant
     * @param integer $last_column  last column in the selected quadrant
     */
-    public function setSelection($first_row,$first_column,$last_row,$last_column)
+    function setSelection($first_row,$first_column,$last_row,$last_column)
     {
         $this->_selection = array($first_row,$first_column,$last_row,$last_column);
     }
@@ -861,7 +850,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *                     3 => Leftmost column visible
     *                     4 => Active pane
     */
-    public function freezePanes($panes)
+    function freezePanes($panes)
     {
         $this->_frozen = 1;
         $this->_panes  = $panes;
@@ -878,7 +867,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *                     3 => Leftmost column visible
     *                     4 => Active pane
     */
-    public function thawPanes($panes)
+    function thawPanes($panes)
     {
         $this->_frozen = 0;
         $this->_panes  = $panes;
@@ -889,7 +878,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access public
     */
-    public function setPortrait()
+    function setPortrait()
     {
         $this->_orientation = 1;
     }
@@ -899,7 +888,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access public
     */
-    public function setLandscape()
+    function setLandscape()
     {
         $this->_orientation = 0;
     }
@@ -910,7 +899,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param integer $size The type of paper size to use
     */
-    public function setPaper($size = 0)
+    function setPaper($size = 0)
     {
         $this->_paper_size = $size;
     }
@@ -923,7 +912,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param string $string The header text
     * @param float  $margin optional head margin in inches.
     */
-    public function setHeader($string,$margin = 0.50)
+    function setHeader($string,$margin = 0.50)
     {
         if (strlen($string) >= 255) {
             //carp 'Header string must be less than 255 characters';
@@ -940,7 +929,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param string $string The footer text
     * @param float  $margin optional foot margin in inches.
     */
-    public function setFooter($string,$margin = 0.50)
+    function setFooter($string,$margin = 0.50)
     {
         if (strlen($string) >= 255) {
             //carp 'Footer string must be less than 255 characters';
@@ -956,7 +945,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param integer $center the optional value for centering. Defaults to 1 (center).
     */
-    public function centerHorizontally($center = 1)
+    function centerHorizontally($center = 1)
     {
         $this->_hcenter = $center;
     }
@@ -967,7 +956,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param integer $center the optional value for centering. Defaults to 1 (center).
     */
-    public function centerVertically($center = 1)
+    function centerVertically($center = 1)
     {
         $this->_vcenter = $center;
     }
@@ -978,7 +967,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param float $margin The margin to set in inches
     */
-    public function setMargins($margin)
+    function setMargins($margin)
     {
         $this->setMarginLeft($margin);
         $this->setMarginRight($margin);
@@ -992,7 +981,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param float $margin The margin to set in inches
     */
-    public function setMargins_LR($margin)
+    function setMargins_LR($margin)
     {
         $this->setMarginLeft($margin);
         $this->setMarginRight($margin);
@@ -1004,7 +993,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param float $margin The margin to set in inches
     */
-    public function setMargins_TB($margin)
+    function setMargins_TB($margin)
     {
         $this->setMarginTop($margin);
         $this->setMarginBottom($margin);
@@ -1016,7 +1005,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param float $margin The margin to set in inches
     */
-    public function setMarginLeft($margin = 0.75)
+    function setMarginLeft($margin = 0.75)
     {
         $this->_margin_left = $margin;
     }
@@ -1027,7 +1016,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param float $margin The margin to set in inches
     */
-    public function setMarginRight($margin = 0.75)
+    function setMarginRight($margin = 0.75)
     {
         $this->_margin_right = $margin;
     }
@@ -1038,7 +1027,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param float $margin The margin to set in inches
     */
-    public function setMarginTop($margin = 1.00)
+    function setMarginTop($margin = 1.00)
     {
         $this->_margin_top = $margin;
     }
@@ -1049,7 +1038,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param float $margin The margin to set in inches
     */
-    public function setMarginBottom($margin = 1.00)
+    function setMarginBottom($margin = 1.00)
     {
         $this->_margin_bottom = $margin;
     }
@@ -1061,7 +1050,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param integer $first_row First row to repeat
     * @param integer $last_row  Last row to repeat. Optional.
     */
-    public function repeatRows($first_row, $last_row = null)
+    function repeatRows($first_row, $last_row = null)
     {
         $this->title_rowmin  = $first_row;
         if (isset($last_row)) { //Second row is optional
@@ -1078,7 +1067,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param integer $first_col First column to repeat
     * @param integer $last_col  Last column to repeat. Optional.
     */
-    public function repeatColumns($first_col, $last_col = null)
+    function repeatColumns($first_col, $last_col = null)
     {
         $this->title_colmin  = $first_col;
         if (isset($last_col)) { // Second col is optional
@@ -1097,7 +1086,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param integer $last_row  Last row of the area to print
     * @param integer $last_col  Last column of the area to print
     */
-    public function printArea($first_row, $first_col, $last_row, $last_col)
+    function printArea($first_row, $first_col, $last_row, $last_col)
     {
         $this->print_rowmin  = $first_row;
         $this->print_colmin  = $first_col;
@@ -1111,7 +1100,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access public
     */
-    public function hideGridlines()
+    function hideGridlines()
     {
         $this->_print_gridlines = 0;
     }
@@ -1121,7 +1110,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access public
     */
-    public function hideScreenGridlines()
+    function hideScreenGridlines()
     {
         $this->_screen_gridlines = 0;
     }
@@ -1132,7 +1121,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param integer $print Whether to print the headers or not. Defaults to 1 (print).
     */
-    public function printRowColHeaders($print = 1)
+    function printRowColHeaders($print = 1)
     {
         $this->_print_headers = $print;
     }
@@ -1146,7 +1135,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param  integer $height Maximun heigth of printed area in pages
     * @see setPrintScale()
     */
-    public function fitToPages($width, $height)
+    function fitToPages($width, $height)
     {
         $this->_fit_page      = 1;
         $this->_fit_width     = $width;
@@ -1160,7 +1149,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param array $breaks Array containing the horizontal page breaks
     */
-    public function setHPagebreaks($breaks)
+    function setHPagebreaks($breaks)
     {
         foreach ($breaks as $break) {
             array_push($this->_hbreaks, $break);
@@ -1174,7 +1163,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param array $breaks Array containing the vertical page breaks
     */
-    public function setVPagebreaks($breaks)
+    function setVPagebreaks($breaks)
     {
         foreach ($breaks as $break) {
             array_push($this->_vbreaks, $break);
@@ -1188,11 +1177,11 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param integer $scale The zoom factor
     */
-    public function setZoom($scale = 100)
+    function setZoom($scale = 100)
     {
         // Confine the scale to Excel's range
         if ($scale < 10 || $scale > 400) {
-            $this->raiseError('Zoom factor ' . $scale . ' outside range: 10 <= zoom <= 400');
+            $this->raiseError("Zoom factor $scale outside range: 10 <= zoom <= 400");
             $scale = 100;
         }
 
@@ -1206,7 +1195,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param integer $scale The optional scale factor. Defaults to 100
     */
-    public function setPrintScale($scale = 100)
+    function setPrintScale($scale = 100)
     {
         // Confine the scale to Excel's range
         if ($scale < 10 || $scale > 400) {
@@ -1229,7 +1218,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param mixed   $token  What we are writing
     * @param mixed   $format The optional format to apply to the cell
     */
-    public function write($row, $col, $token, $format = null)
+    function write($row, $col, $token, $format = null)
     {
         // Check for a cell reference in A1 notation and substitute row and column
         /*if ($_[0] =~ /^\D/) {
@@ -1271,7 +1260,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @return mixed PEAR_Error on failure
     */
 
-    public function writeRow($row, $col, $val, $format = null)
+    function writeRow($row, $col, $val, $format = null)
     {
         $retval = '';
         if (is_array($val)) {
@@ -1300,7 +1289,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @return mixed PEAR_Error on failure
     */
 
-    public function writeCol($row, $col, $val, $format = null)
+    function writeCol($row, $col, $val, $format = null)
     {
         $retval = '';
         if (is_array($val)) {
@@ -1318,10 +1307,10 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * Returns an index to the XF record in the workbook
     *
     * @access private
-    * @param mixed $format The optional XF format
+    * @param mixed &$format The optional XF format
     * @return integer The XF record index
     */
-    protected function _XF($format)
+    function _XF(&$format)
     {
         if ($format) {
             return($format->getXfIndex());
@@ -1345,17 +1334,17 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access private
     * @param string $data The binary data to append
     */
-    protected function _append($data)
+    function _append($data)
     {
         if ($this->_using_tmpfile) {
             // Add CONTINUE records if necessary
-            if (strlen($data) > $this->limit) {
-                $data = $this->addContinue($data);
+            if (strlen($data) > $this->_limit) {
+                $data = $this->_addContinue($data);
             }
             fwrite($this->_filehandle, $data);
-            $this->dataSize += strlen($data);
+            $this->_datasize += strlen($data);
         } else {
-            parent::append($data);
+            parent::_append($data);
         }
     }
 
@@ -1369,7 +1358,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param string $cell The cell reference. Or range of cells.
     * @return array
     */
-    protected function _substituteCellref($cell)
+    function _substituteCellref($cell)
     {
         $cell = strtoupper($cell);
 
@@ -1405,7 +1394,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param string $cell The cell reference.
     * @return array containing (row, column)
     */
-    protected function _cellToRowcol($cell)
+    function _cellToRowcol($cell)
     {
         preg_match("/\$?([A-I]?[A-Z])\$?(\d+)/",$cell,$match);
         $col     = $match[1];
@@ -1436,7 +1425,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param string $plaintext The password to be encoded in plaintext.
     * @return string The encoded password
     */
-    protected function _encodePassword($plaintext)
+    function _encodePassword($plaintext)
     {
         $password = 0x0000;
         $i        = 1;       // char position
@@ -1466,7 +1455,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param bool $symbols_right
     * @param bool $auto_style
     */
-    public function setOutline($visible = true, $symbols_below = true, $symbols_right = true, $auto_style = false)
+    function setOutline($visible = true, $symbols_below = true, $symbols_right = true, $auto_style = false)
     {
         $this->_outline_on    = $visible;
         $this->_outline_below = $symbols_below;
@@ -1484,7 +1473,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @param bool $rtl
     */
-    public function setRTL($rtl = true)
+    function setRTL($rtl = true)
     {
         $this->_Arabic = ($rtl ? 1 : 0);
      }
@@ -1511,7 +1500,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param mixed   $format The optional XF format
     * @return integer
     */
-    public function writeNumber($row, $col, $num, $format = null)
+    function writeNumber($row, $col, $num, $format = null)
     {
         $record    = 0x0203;                 // Record identifier
         $length    = 0x000E;                 // Number of bytes to follow
@@ -1541,7 +1530,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         $header    = pack("vv",  $record, $length);
         $data      = pack("vvv", $row, $col, $xf);
         $xl_double = pack("d",   $num);
-        if ($this->byteOrder) { // if it's Big Endian
+        if ($this->_byte_order) { // if it's Big Endian
             $xl_double = strrev($xl_double);
         }
 
@@ -1564,9 +1553,9 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param mixed   $format The XF format for the cell
     * @return integer
     */
-    public function writeString($row, $col, $str, $format = null)
+    function writeString($row, $col, $str, $format = null)
     {
-        if ($this->BIFF_version == 0x0600) {
+        if ($this->_BIFF_version == 0x0600) {
             return $this->writeStringBIFF8($row, $col, $str, $format);
         }
         $strlen    = strlen($str);
@@ -1615,7 +1604,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access public
     * @param string $encoding The encoding. Ex: 'UTF-16LE', 'utf-8', 'ISO-859-7'
     */
-    public function setInputEncoding($encoding)
+    function setInputEncoding($encoding)
     {
          if ($encoding != 'UTF-16LE' && !function_exists('iconv')) {
              $this->raiseError("Using an input encoding other than UTF-16LE requires PHP support for iconv");
@@ -1638,7 +1627,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param mixed   $format The XF format for the cell
     * @return integer
     */
-    public function writeStringBIFF8($row, $col, $str, $format = null)
+    function writeStringBIFF8($row, $col, $str, $format = null)
     {
         // If the string is Unicode and contains any "surrogate pairs" then using mb_strlen($str, 'UTF-16LE')
         // as the string length will cause a "found unreadable content" error when opening the worksheet in Excel
@@ -1696,7 +1685,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @return boolean true for success, false if row and/or col are grester
     *                 then maximums allowed.
     */
-    protected function _checkRowCol($row, $col)
+    function _checkRowCol($row, $col)
     {
         if ($row >= $this->_xls_rowmax) {
             return false;
@@ -1728,7 +1717,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param integer $col    Zero indexed column
     * @param string  $note   The note to write
     */
-    public function writeNote($row, $col, $note)
+    function writeNote($row, $col, $note)
     {
         $note_length    = strlen($note);
         $record         = 0x001C;                // Record identifier
@@ -1788,7 +1777,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param integer $col    Zero indexed column
     * @param mixed   $format The XF format
     */
-    public function writeBlank($row, $col, $format)
+    function writeBlank($row, $col, $format)
     {
         // Don't write a blank cell unless it has a format
         if (!$format) {
@@ -1841,7 +1830,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param mixed   $format  The optional XF format
     * @return integer
     */
-    public function writeFormula($row, $col, $formula, $format = null)
+    function writeFormula($row, $col, $formula, $format = null)
     {
         $record    = 0x0006;     // Record identifier
 
@@ -1919,7 +1908,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param mixed   $format The cell format
     * @return integer
     */
-    public function writeUrl($row, $col, $url, $string = '', $format = null)
+    function writeUrl($row, $col, $url, $string = '', $format = null)
     {
         // Add start row and col to arg list
         return($this->_writeUrlRange($row, $col, $row, $col, $url, $string, $format));
@@ -1943,7 +1932,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @return integer
     */
 
-    protected function _writeUrlRange($row1, $col1, $row2, $col2, $url, $string = '', $format = null)
+    function _writeUrlRange($row1, $col1, $row2, $col2, $url, $string = '', $format = null)
     {
 
         // Check for internal/external sheet links or default to web link
@@ -1973,7 +1962,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param mixed   $format The cell format
     * @return integer
     */
-    protected function _writeUrlWeb($row1, $col1, $row2, $col2, $url, $str, $format = null)
+    function _writeUrlWeb($row1, $col1, $row2, $col2, $url, $str, $format = null)
     {
         $record      = 0x01B8;                       // Record identifier
         $length      = 0x00000;                      // Bytes to follow
@@ -2033,7 +2022,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param mixed   $format The cell format
     * @return integer
     */
-    protected function _writeUrlInternal($row1, $col1, $row2, $col2, $url, $str, $format = null)
+    function _writeUrlInternal($row1, $col1, $row2, $col2, $url, $str, $format = null)
     {
         $record      = 0x01B8;                       // Record identifier
         $length      = 0x00000;                      // Bytes to follow
@@ -2099,7 +2088,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param mixed   $format The cell format
     * @return integer
     */
-    protected function _writeUrlExternal($row1, $col1, $row2, $col2, $url, $str, $format = null)
+    function _writeUrlExternal($row1, $col1, $row2, $col2, $url, $str, $format = null)
     {
         // Network drives are different. We will handle them separately
         // MS/Novell network drives and shares start with \\
@@ -2229,7 +2218,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param bool    $hidden The optional hidden attribute
     * @param integer $level  The optional outline level for row, in range [0,7]
     */
-    public function setRow($row, $height, $format = null, $hidden = false, $level = 0)
+    function setRow($row, $height, $format = null, $hidden = false, $level = 0)
     {
         $record      = 0x0208;               // Record identifier
         $length      = 0x0010;               // Number of bytes to follow
@@ -2282,7 +2271,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeDimensions()
+    function _storeDimensions()
     {
         $record    = 0x0200;                 // Record identifier
         $row_min   = $this->_dim_rowmin;     // First row
@@ -2291,17 +2280,17 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         $col_max   = $this->_dim_colmax + 1; // Last column plus 1
         $reserved  = 0x0000;                 // Reserved by Excel
 
-        if ($this->BIFF_version == 0x0500) {
+        if ($this->_BIFF_version == 0x0500) {
             $length    = 0x000A;               // Number of bytes to follow
             $data      = pack("vvvvv", $row_min, $row_max,
                                        $col_min, $col_max, $reserved);
-        } elseif ($this->BIFF_version == 0x0600) {
+        } elseif ($this->_BIFF_version == 0x0600) {
             $length    = 0x000E;
             $data      = pack("VVvvv", $row_min, $row_max,
                                        $col_min, $col_max, $reserved);
         }
         $header = pack("vv", $record, $length);
-        $this->prepend($header.$data);
+        $this->_prepend($header.$data);
     }
 
     /**
@@ -2309,12 +2298,12 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeWindow2()
+    function _storeWindow2()
     {
         $record         = 0x023E;     // Record identifier
-        if ($this->BIFF_version == 0x0500) {
+        if ($this->_BIFF_version == 0x0500) {
             $length         = 0x000A;     // Number of bytes to follow
-        } elseif ($this->BIFF_version == 0x0600) {
+        } elseif ($this->_BIFF_version == 0x0600) {
             $length         = 0x0012;
         }
 
@@ -2351,10 +2340,10 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         $header  = pack("vv",   $record, $length);
         $data    = pack("vvv", $grbit, $rwTop, $colLeft);
         // FIXME !!!
-        if ($this->BIFF_version == 0x0500) {
+        if ($this->_BIFF_version == 0x0500) {
             $rgbHdr         = 0x00000000; // Row/column heading and gridline color
             $data .= pack("V", $rgbHdr);
-        } elseif ($this->BIFF_version == 0x0600) {
+        } elseif ($this->_BIFF_version == 0x0600) {
             $rgbHdr       = 0x0040; // Row/column heading and gridline color index
             $zoom_factor_page_break = 0x0000;
             $zoom_factor_normal     = 0x0000;
@@ -2368,7 +2357,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeDefcol()
+    function _storeDefcol()
     {
         $record   = 0x0055;      // Record identifier
         $length   = 0x0002;      // Number of bytes to follow
@@ -2376,7 +2365,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         $header   = pack("vv", $record, $length);
         $data     = pack("v",  $colwidth);
-        $this->prepend($header . $data);
+        $this->_prepend($header . $data);
     }
 
     /**
@@ -2394,7 +2383,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *                4 => Option flags.
     *                5 => Optional outline level
     */
-    protected function _storeColinfo($col_array)
+    function _storeColinfo($col_array)
     {
         if (isset($col_array[0])) {
             $colFirst = $col_array[0];
@@ -2437,7 +2426,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         $header   = pack("vv",     $record, $length);
         $data     = pack("vvvvvC", $colFirst, $colLast, $coldx,
                                    $ixfe, $grbit, $reserved);
-        $this->prepend($header.$data);
+        $this->_prepend($header.$data);
     }
 
     /**
@@ -2447,7 +2436,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param array $array array containing ($rwFirst,$colFirst,$rwLast,$colLast)
     * @see setSelection()
     */
-    protected function _storeSelection($array)
+    function _storeSelection($array)
     {
         list($rwFirst,$colFirst,$rwLast,$colLast) = $array;
         $record   = 0x001D;                  // Record identifier
@@ -2488,7 +2477,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeMergedCells()
+    function _storeMergedCells()
     {
         // if there are no merged cell ranges set, return
         if (count($this->_merged_ranges) == 0) {
@@ -2520,14 +2509,14 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access private
     * @param integer $count The number of external sheet references in this worksheet
     */
-    protected function _storeExterncount($count)
+    function _storeExterncount($count)
     {
         $record = 0x0016;          // Record identifier
         $length = 0x0002;          // Number of bytes to follow
 
         $header = pack("vv", $record, $length);
         $data   = pack("v",  $count);
-        $this->prepend($header . $data);
+        $this->_prepend($header . $data);
     }
 
     /**
@@ -2539,7 +2528,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @access private
     * @param string $sheetname The name of a external worksheet
     */
-    protected function _storeExternsheet($sheetname)
+    function _storeExternsheet($sheetname)
     {
         $record    = 0x0017;         // Record identifier
 
@@ -2559,7 +2548,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         $header = pack("vv",  $record, $length);
         $data   = pack("CC", $cch, $rgch);
-        $this->prepend($header . $data . $sheetname);
+        $this->_prepend($header . $data . $sheetname);
     }
 
     /**
@@ -2576,7 +2565,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *                     3 => Leftmost column visible
     *                     4 => Active pane
     */
-    protected function _storePanes($panes)
+    function _storePanes($panes)
     {
         $y       = $panes[0];
         $x       = $panes[1];
@@ -2648,7 +2637,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeSetup()
+    function _storeSetup()
     {
         $record       = 0x00A1;                  // Record identifier
         $length       = 0x0022;                  // Number of bytes to follow
@@ -2685,7 +2674,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         $numHdr = pack("d", $numHdr);
         $numFtr = pack("d", $numFtr);
-        if ($this->byteOrder) { // if it's Big Endian
+        if ($this->_byte_order) { // if it's Big Endian
             $numHdr = strrev($numHdr);
             $numFtr = strrev($numFtr);
         }
@@ -2701,7 +2690,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
                                    $iVRes);
         $data2  = $numHdr.$numFtr;
         $data3  = pack("v", $iCopies);
-        $this->prepend($header . $data1 . $data2 . $data3);
+        $this->_prepend($header . $data1 . $data2 . $data3);
     }
 
     /**
@@ -2709,13 +2698,13 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeHeader()
+    function _storeHeader()
     {
         $record  = 0x0014;               // Record identifier
 
         $str      = $this->_header;       // header string
         $cch      = strlen($str);         // Length of header string
-        if ($this->BIFF_version == 0x0600) {
+        if ($this->_BIFF_version == 0x0600) {
             $encoding = 0x0;                  // TODO: Unicode support
             $length   = 3 + $cch;             // Bytes to follow
         } else {
@@ -2723,13 +2712,13 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         }
 
         $header   = pack("vv", $record, $length);
-        if ($this->BIFF_version == 0x0600) {
+        if ($this->_BIFF_version == 0x0600) {
             $data     = pack("vC",  $cch, $encoding);
         } else {
             $data      = pack("C",  $cch);
         }
 
-        $this->prepend($header.$data.$str);
+        $this->_prepend($header.$data.$str);
     }
 
     /**
@@ -2737,13 +2726,13 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeFooter()
+    function _storeFooter()
     {
         $record  = 0x0015;               // Record identifier
 
         $str      = $this->_footer;       // Footer string
         $cch      = strlen($str);         // Length of footer string
-        if ($this->BIFF_version == 0x0600) {
+        if ($this->_BIFF_version == 0x0600) {
             $encoding = 0x0;                  // TODO: Unicode support
             $length   = 3 + $cch;             // Bytes to follow
         } else {
@@ -2751,13 +2740,13 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         }
 
         $header    = pack("vv", $record, $length);
-        if ($this->BIFF_version == 0x0600) {
+        if ($this->_BIFF_version == 0x0600) {
             $data      = pack("vC",  $cch, $encoding);
         } else {
             $data      = pack("C",  $cch);
         }
 
-        $this->prepend($header . $data . $str);
+        $this->_prepend($header . $data . $str);
     }
 
     /**
@@ -2765,7 +2754,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeHcenter()
+    function _storeHcenter()
     {
         $record   = 0x0083;              // Record identifier
         $length   = 0x0002;              // Bytes to follow
@@ -2775,7 +2764,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         $header    = pack("vv", $record, $length);
         $data      = pack("v",  $fHCenter);
 
-        $this->prepend($header.$data);
+        $this->_prepend($header.$data);
     }
 
     /**
@@ -2783,7 +2772,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeVcenter()
+    function _storeVcenter()
     {
         $record   = 0x0084;              // Record identifier
         $length   = 0x0002;              // Bytes to follow
@@ -2792,7 +2781,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         $header    = pack("vv", $record, $length);
         $data      = pack("v",  $fVCenter);
-        $this->prepend($header . $data);
+        $this->_prepend($header . $data);
     }
 
     /**
@@ -2800,7 +2789,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeMarginLeft()
+    function _storeMarginLeft()
     {
         $record  = 0x0026;                   // Record identifier
         $length  = 0x0008;                   // Bytes to follow
@@ -2809,11 +2798,11 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         $header    = pack("vv",  $record, $length);
         $data      = pack("d",   $margin);
-        if ($this->byteOrder) { // if it's Big Endian
+        if ($this->_byte_order) { // if it's Big Endian
             $data = strrev($data);
         }
 
-        $this->prepend($header . $data);
+        $this->_prepend($header . $data);
     }
 
     /**
@@ -2821,7 +2810,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeMarginRight()
+    function _storeMarginRight()
     {
         $record  = 0x0027;                   // Record identifier
         $length  = 0x0008;                   // Bytes to follow
@@ -2830,11 +2819,11 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         $header    = pack("vv",  $record, $length);
         $data      = pack("d",   $margin);
-        if ($this->byteOrder) { // if it's Big Endian
+        if ($this->_byte_order) { // if it's Big Endian
             $data = strrev($data);
         }
 
-        $this->prepend($header . $data);
+        $this->_prepend($header . $data);
     }
 
     /**
@@ -2842,7 +2831,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeMarginTop()
+    function _storeMarginTop()
     {
         $record  = 0x0028;                   // Record identifier
         $length  = 0x0008;                   // Bytes to follow
@@ -2851,11 +2840,11 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         $header    = pack("vv",  $record, $length);
         $data      = pack("d",   $margin);
-        if ($this->byteOrder) { // if it's Big Endian
+        if ($this->_byte_order) { // if it's Big Endian
             $data = strrev($data);
         }
 
-        $this->prepend($header . $data);
+        $this->_prepend($header . $data);
     }
 
     /**
@@ -2863,7 +2852,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeMarginBottom()
+    function _storeMarginBottom()
     {
         $record  = 0x0029;                   // Record identifier
         $length  = 0x0008;                   // Bytes to follow
@@ -2872,11 +2861,11 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         $header    = pack("vv",  $record, $length);
         $data      = pack("d",   $margin);
-        if ($this->byteOrder) { // if it's Big Endian
+        if ($this->_byte_order) { // if it's Big Endian
             $data = strrev($data);
         }
 
-        $this->prepend($header . $data);
+        $this->_prepend($header . $data);
     }
 
     /**
@@ -2890,7 +2879,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param integer $last_row  Last row of the area to merge
     * @param integer $last_col  Last column of the area to merge
     */
-    public function mergeCells($first_row, $first_col, $last_row, $last_col)
+    function mergeCells($first_row, $first_col, $last_row, $last_col)
     {
         $record  = 0x00E5;                   // Record identifier
         $length  = 0x000A;                   // Bytes to follow
@@ -2917,7 +2906,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storePrintHeaders()
+    function _storePrintHeaders()
     {
         $record      = 0x002a;                   // Record identifier
         $length      = 0x0002;                   // Bytes to follow
@@ -2926,7 +2915,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         $header      = pack("vv", $record, $length);
         $data        = pack("v", $fPrintRwCol);
-        $this->prepend($header . $data);
+        $this->_prepend($header . $data);
     }
 
     /**
@@ -2935,7 +2924,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storePrintGridlines()
+    function _storePrintGridlines()
     {
         $record      = 0x002b;                    // Record identifier
         $length      = 0x0002;                    // Bytes to follow
@@ -2944,7 +2933,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         $header      = pack("vv", $record, $length);
         $data        = pack("v", $fPrintGrid);
-        $this->prepend($header . $data);
+        $this->_prepend($header . $data);
     }
 
     /**
@@ -2953,7 +2942,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeGridset()
+    function _storeGridset()
     {
         $record      = 0x0082;                        // Record identifier
         $length      = 0x0002;                        // Bytes to follow
@@ -2962,7 +2951,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         $header      = pack("vv",  $record, $length);
         $data        = pack("v",   $fGridSet);
-        $this->prepend($header . $data);
+        $this->_prepend($header . $data);
     }
 
     /**
@@ -2973,7 +2962,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @see _storeWsbool()
     * @access private
     */
-    protected function _storeGuts()
+    function _storeGuts()
     {
         $record      = 0x0080;   // Record identifier
         $length      = 0x0008;   // Bytes to follow
@@ -3008,7 +2997,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         $header = pack("vv",   $record, $length);
         $data   = pack("vvvv", $dxRwGut, $dxColGut, $row_level, $col_level);
 
-        $this->prepend($header.$data);
+        $this->_prepend($header.$data);
     }
 
 
@@ -3018,7 +3007,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeWsbool()
+    function _storeWsbool()
     {
         $record      = 0x0081;   // Record identifier
         $length      = 0x0002;   // Bytes to follow
@@ -3052,7 +3041,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         $header = pack("vv", $record, $length);
         $data   = pack("v",  $grbit);
-        $this->prepend($header . $data);
+        $this->_prepend($header . $data);
     }
 
     /**
@@ -3060,7 +3049,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeHbreak()
+    function _storeHbreak()
     {
         // Return if the user hasn't specified pagebreaks
         if (empty($this->_hbreaks)) {
@@ -3076,7 +3065,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         $record  = 0x001b;               // Record identifier
         $cbrk    = count($breaks);       // Number of page breaks
-        if ($this->BIFF_version == 0x0600) {
+        if ($this->_BIFF_version == 0x0600) {
             $length  = 2 + 6*$cbrk;      // Bytes to follow
         } else {
             $length  = 2 + 2*$cbrk;      // Bytes to follow
@@ -3087,14 +3076,14 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         // Append each page break
         foreach ($breaks as $break) {
-            if ($this->BIFF_version == 0x0600) {
+            if ($this->_BIFF_version == 0x0600) {
                 $data .= pack("vvv", $break, 0x0000, 0x00ff);
             } else {
                 $data .= pack("v", $break);
             }
         }
 
-        $this->prepend($header.$data);
+        $this->_prepend($header.$data);
     }
 
 
@@ -3103,7 +3092,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeVbreak()
+    function _storeVbreak()
     {
         // Return if the user hasn't specified pagebreaks
         if (empty($this->_vbreaks)) {
@@ -3122,7 +3111,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         $record  = 0x001a;               // Record identifier
         $cbrk    = count($breaks);       // Number of page breaks
-        if ($this->BIFF_version == 0x0600) {
+        if ($this->_BIFF_version == 0x0600) {
             $length  = 2 + 6*$cbrk;      // Bytes to follow
         } else {
             $length  = 2 + 2*$cbrk;      // Bytes to follow
@@ -3133,14 +3122,14 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
 
         // Append each page break
         foreach ($breaks as $break) {
-            if ($this->BIFF_version == 0x0600) {
+            if ($this->_BIFF_version == 0x0600) {
                 $data .= pack("vvv", $break, 0x0000, 0xffff);
             } else {
                 $data .= pack("v", $break);
             }
         }
 
-        $this->prepend($header . $data);
+        $this->_prepend($header . $data);
     }
 
     /**
@@ -3148,7 +3137,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeProtect()
+    function _storeProtect()
     {
         // Exit unless sheet protection has been specified
         if ($this->_protect == 0) {
@@ -3163,7 +3152,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         $header      = pack("vv", $record, $length);
         $data        = pack("v",  $fLock);
 
-        $this->prepend($header.$data);
+        $this->_prepend($header.$data);
     }
 
     /**
@@ -3171,7 +3160,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storePassword()
+    function _storePassword()
     {
         // Exit unless sheet protection and password have been specified
         if (($this->_protect == 0) || (!isset($this->_password))) {
@@ -3186,7 +3175,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         $header      = pack("vv", $record, $length);
         $data        = pack("v",  $wPassword);
 
-        $this->prepend($header . $data);
+        $this->_prepend($header . $data);
     }
 
 
@@ -3202,7 +3191,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param integer $scale_x The horizontal scale
     * @param integer $scale_y The vertical scale
     */
-    public function insertBitmap($row, $col, $bitmap, $x = 0, $y = 0, $scale_x = 1, $scale_y = 1)
+    function insertBitmap($row, $col, $bitmap, $x = 0, $y = 0, $scale_x = 1, $scale_y = 1)
     {
         $bitmap_array = $this->_processBitmap($bitmap);
         if ($this->isError($bitmap_array)) {
@@ -3280,7 +3269,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param integer $width     Width of image frame
     * @param integer $height    Height of image frame
     */
-    protected function _positionImage($col_start, $row_start, $x1, $y1, $width, $height)
+    function _positionImage($col_start, $row_start, $x1, $y1, $width, $height)
     {
         // Initialise end cell to the same as the start cell
         $col_end    = $col_start;  // Col containing lower right corner of object
@@ -3346,7 +3335,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param integer $col The column
     * @return integer The width in pixels
     */
-    protected function _sizeCol($col)
+    function _sizeCol($col)
     {
         // Look up the cell value to see if it has been changed
         if (isset($this->col_sizes[$col])) {
@@ -3370,7 +3359,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param integer $row The row
     * @return integer The width in pixels
     */
-    protected function _sizeRow($row)
+    function _sizeRow($row)
     {
         // Look up the cell value to see if it has been changed
         if (isset($this->_row_sizes[$row])) {
@@ -3398,7 +3387,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param integer $rwB  Row containing bottom right corner of object
     * @param integer $dyB  Distance from bottom of cell
     */
-    protected function _storeObjPicture($colL,$dxL,$rwT,$dyT,$colR,$dxR,$rwB,$dyB)
+    function _storeObjPicture($colL,$dxL,$rwT,$dyT,$colR,$dxR,$rwB,$dyB)
     {
         $record      = 0x005d;   // Record identifier
         $length      = 0x003c;   // Bytes to follow
@@ -3473,7 +3462,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param string $bitmap The bitmap to process
     * @return array Array with data and properties of the bitmap
     */
-    protected function _processBitmap($bitmap)
+    function _processBitmap($bitmap)
     {
         // Open file.
         $bmp_fd = @fopen($bitmap,"rb");
@@ -3557,7 +3546,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeZoom()
+    function _storeZoom()
     {
         // If scale is 100 we don't need to write a record
         if ($this->_zoom == 100) {
@@ -3575,7 +3564,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     /**
     * FIXME: add comments
     */
-    public function setValidation($row1, $col1, $row2, $col2, $validator)
+    function setValidation($row1, $col1, $row2, $col2, &$validator)
     {
         $this->_dv[] = $validator->_getData() .
                        pack("vvvvv", 1, $row1, $row2, $col1, $col2);
@@ -3586,7 +3575,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     *
     * @access private
     */
-    protected function _storeDataValidity()
+    function _storeDataValidity()
     {
         $record      = 0x01b2;      // Record identifier
         $length      = 0x0012;      // Bytes to follow