Foros del Web - Problema con index.php

Hola:
Tengo un problema con ur archivo index.php, que se comporta de distinta manera en el Iexplorer y en el Firefox.
En Iexplorer:
http://www.dirab51.net/ciexplorer.jpg

En Firefox:
http://www.dirab51.net/cfirefox.jpg

El script es este:

<?php
defined( '_VALID_MOS' ) or die( 'Restricted access' );
// needed to seperate the ISO number from the language file constant _ISO
$iso = explode( '=', _ISO );
// xml prolog
echo '<?xml version="1.0" encoding="'. $iso[1] .'"?' .'>';
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<?php mosShowHead(); ?>
<?php
if ( $my->id ) {
initEditor();
}
$collspan_offset = ( mosCountModules( 'right', 'left' ) + mosCountModules( 'user2' ) ) ? 2 : 1;
//script to determine which div setup for layout to use based on module configuration
$user1 = 0;
$user2 = 0;
$colspan = 0;
$right = 0;
$left = 0;
$banner = 0;
// banner combos

//user1 combos
if ( mosCountModules( 'user1' ) + mosCountModules( 'user2' ) == 2) {
$user1 = 2;
$user2 = 2;
$colspan = 3;
} elseif ( mosCountModules( 'user1' ) == 1 ) {
$user1 = 1;
$colspan = 1;
} elseif ( mosCountModules( 'user2' ) == 1 ) {
$user2 = 1;
$colspan = 1;
}
//banner based combos
if ( mosCountModules( 'banner' ) and ( empty( $_REQUEST['task'] ) || $_REQUEST['task'] != 'edit' ) ) {
$banner = 1;

}

//right based combos
if ( mosCountModules( 'right' ) and ( empty( $_REQUEST['task'] ) || $_REQUEST['task'] != 'edit' ) ) {
$right = 1;

}
//left based combos
if ( mosCountModules( 'left' ) and ( empty( $_REQUEST['task'] ) || $_REQUEST['task'] != 'edit' ) ) {
$left = 1;

}
//top based combos
if ( mosCountModules( 'top' ) and ( empty( $_REQUEST['task'] ) || $_REQUEST['task'] != 'edit' ) ) {
$top = 1;

}
?>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<?php echo "<link rel=\"stylesheet\" href=\"$GLOBALS[mosConfig_live_site]/templates/$GLOBALS[cur_template]/css/template_css.css\" type=\"text/css\"/>" ; ?><?php echo "<link rel=\"shortcut icon\" href=\"$GLOBALS[mosConfig_live_site]/images/favicon.ico\" />" ; ?>
<link href="css/template_css.css" rel="stylesheet" type="text/css" />
<style type="text/css">

</style></head>
<body>

<tr>
<td id="header"><div id="header_inner"></div>
<div id="banner">
<div id="banner_inner"><?php mosLoadModules( "banner", -1 ); ?>
</div>
</div></td>
</tr>
<tr></tr>
<tr>
<td id="content_outer" valign="top">
<table align="center" border="0" cellpadding="0" cellspacing="0" width="100%" class="content_table">
<tr valign="top">
<?php
if ( $left > 0 ) {
?>
<td>
<div id="left_outer">
<div id="left_header"></div>
<div id="left_inner_float">
<div id="left_inner">
<?php mosLoadModules ( 'left', -2 ); ?>
</div></div>
<div id="left_footer"></div>
</div> </td>
<?php
}
?>
<td width="100%" id="content"><div>
<div id="content_top"><div id="content_top_corner"></div></div>
<table width="100%" border="0" align="center" cellpadding="0" cellspacing="0" class="content">
<tr>
<td colspan="<?php echo $colspan; ?>"><div id="pathway"> <div id="pathway_text">
<?php mosPathWay(); ?>
</div> </div>
<div id="main_content"><?php mosMainBody(); ?></div> </td>
</tr>

<?php
if ($colspan > 0) {
?>
<tr valign="top">

<?php
if ( $user1 > 0 ) {
?>
<td width="50%">
<div id="user1_outer"><div class="user1_inner">
<?php mosLoadModules ( 'user1', -2 ); ?>
</div> </div> </td>
<?php
}
if ( $colspan == 3) {
?>

<?php
}
if ( $user2 > 0 ) {
?>
<td width="50%">
<div id="user2_outer">
<div class="user2_inner">
<?php mosLoadModules ( 'user2', -2 ); ?>
</div> </div> </td>
<?php
}
?>
</tr>
<tr>
<td colspan="<?php echo $colspan; ?>"> </td>
</tr>
<?php
}
?>
</table> <div id="content_foot"><div id="content_foot_corner"></div></div> </div> </td>
<?php
if ( $right > 0 ) {
?>
<td>
<div id="right_outer">
<div id="right_header"></div>
<div id="right_inner_float">
<div id="right_inner">
<?php mosLoadModules ( 'right', -2 ); ?>
</div></div><div id="right_footer"></div>
</div> </td>
<?php
}
?>
</tr>
</table> </td>
</tr>
<tr><?php
if ( $banner > 0 ) {
?>
<td id="user"></td>
<?php
}
?>
</tr>
<tr>
<td id="footer"><?php include_once('includes/footer.php'); ?></td>
</tr>
</table>
<?php mosLoadModules( 'debug', -1 );?>
</body>
</html>

:-) Podrian ayudarme:
Gracias y saludos :si: