A problem with Different browsers..

<?php require_once( "includes\ connection. php"); ?>
<?php require_once( "includes/ functions. php"); ?>
<?php if (isset($_GET[ 'menu_iteam_ no'])){
$sel_menu=get_ rawdata($ _GET["menu_ iteam_no" ]);

} else {
$sel_menu= NULL;
}
?>
<?php if (isset($_GET[ 'menu_iteam_ no'])){
$content=content( $_GET["menu_ iteam_no" ]);

} else {
$content= content(1);
}
?>

<?php include("includes/ header.php" ); ?>

<table id="structure" border="0" cellpadding= "0" cellspacing= "0" width="100%" height="100% ">
<tr valign="top" >
<td width="10%" rowspan="0" background=" pictures\ bac.jpg"> </td>
<td id="navigation" width="20%" height="500px" >
<?php //navigation bar creation
if(isset($_GET[ "menu_iteam_ no"])){
echo navigation($ _GET["menu_ iteam_no" ]);
} else{
$ab=1;
echo navigation($ ab);
}
?>
<div class="images" >
<a href="Mainpage. php?menu_ iteam_no= 8"><img alt="privatedine" class="privatedine" src="pictures\ slate.jpg" ></img></ a>
<img alt="address" class="address" src="pictures\ address.jpg" width="200px" />
</div>
</td>
<td id="page" width="60%" height="500px" >
<?php if(!is_null( $sel_menu) ){ ?>

<h1 class="SelectedMenu "><?php echo $sel_menu['Menu_ name'] ; ?> </h1>
<?php } else { ?>
<h1 class="SelectedMenu "> Home </h1>
<?php } ?>


<?php // Brings content from db by id ?>
<?php
echo $content["Content" ];
?>

</td>
<td width="10%" rowspan="0" background=" pictures\ bac.jpg"> </td>

</tr>

</table>
<?php require("includes/ footer.php" ); ?>