http://www.yousite.com/index.php?1
http://www.yousite.com/index.php?2
http://www.yousite.com/index.php?3


this is a wxample of link. i don't know how is it work nut i wont make as like for my site. when i click on any catagory the first link is active and then i click on second catgary the 2nd link is active . i want teach this ,. thanks replay me amrkhan@live.com

I think what you want is something similar to tabs. While one is selected the rest are not and vice versa.

You would apply the script like so(may need modification):

PHP Code:

<?php
$id = $_GET['id'];
?>

<style>.selected{background-color:#CECECE;}</style>
<strong class="<?=($id==1?'selected':'')?>">Test 1</strong><br />
<strong class="<?=($id==2?'selected':'')?>">Test 2</strong><br />
<strong class="<?=($id==3?'selected':'')?>">Test 3</strong><br />

So you would then point your browser to something like "thisfile.php?id=1" and Test 1 would have a grey background color.