PHP and Javascript

Hi,

Can someone help me with this:

I've a page called: index.php

I want to add a variable 'w'with the screen width so I can use the variable 'w' for php purposes.

Here's the code I use now:


<?php
if ( !isset($w) ) { ?>

<SCRIPT language="JavaScript">
<!--
var w = screen.width;

window.location.replace("<?php echo (basename($PHP_SELF) ?>?w=" + w );
//-->
</SCRIPT>


This works fine when there all no other variables after index.php, but what if there's already an index.php?x=10

How can I adjust the script so I get

index.php?w=1024

or

index.php?x=10&w=1024

when needed?

Thanx,

Marcel

<?php
if (!isset($w) || !isset($h) ) {
?>

<script language="JavaScript">
<![CDATA[
var w = screen.width;
var h = screen.height;
window.location.replace("<?php echo (basename($PHP_SELF) ?>?w="+w+"&h="+h);
//-->
</script>

aside from the XHTML-compliant CDATA thing that I probably screwed up, that should work. It will give you the width ($w) and the height ($h).