well this forum uses the tid get value to know what thread to grab from the database , but i think you want to use something really simple like
code:
<?php
$x = isset($_GET['page']) ? $_GET['page'] : 'home';
if($x=='about'){?>
<--- about page html here --->
<? }else if($x=='other'){ ?>
<--- other page html here --->
<?}else{?>
<--- defult page html here --->
<? }?>
so say if someone goes to your page blah.php?page=about it will show <--- about page html here --->
thats for a really simple one though...