<?php
$allowed = array('home' => 'main.php', 'abstractdesigns' => 'abstractdesigns.php', 'codetango' => 'codetango.php', 'dialsim' => 'dialsim.php', 'parkourworldwide' => 'pkww.php', 'teaminsanity' => 'teaminsanity.php', 'develop' => 'develop.php');
//first let's see if there's a page defined
if (empty($_GET['page'])) {
    include($allowed['home']);
} else {
    if (in_array($_GET['page'], $allowed)) {
        include($allowed[$_GET['page']]);
    } else {
        echo 'Invalid page, cannot display.';
        exit;
    }
}
?>