PHP ?id= multiple code error

hey! i am currently trying to use the php code for multiple pages in one file via the ?id= code. i am using the php file redir.php. here is the code:

<?php
$id = $_GET['id'];
if($id == ''){
regular page //code or include goes here
}
elseif($id == 1){
id 1 //code or include goes here
}
//repeat for all styles/pages.
?>


and i cannot get it to work. it redirects you, but the page is blank. can you tell me what is wrong? thanks!

 

to try it, go to

HTML:

<a href="http://nebraskageek.com/php">nebraskageek.com/php</a>

 

THAT was wierd: nebraskageek.com/php
thats the url to try it