<?php

include 'header.php';

$nav = $_GET['nav'];

switch ($nav) {
case "about":
   include 'about.php';
   break;
case "prereq":
   include 'prerequisites.php';
   break;
case "download":
   include 'download.php';
   break;
case "contact":
   include 'contact.php';
   break;
 default:
   include 'about.php';
}
 
include 'footer.php';

?>