Mine

<?php
        $items = array("Home", "Products", "Projects", "Contact");

        $firstTime = true;
        $page = $_REQUEST['page'];
        print '<ul id="main_nav_list">';
        foreach ($items as $item) {
                print '<li><a class=';
                if ($firstTime && !isset($_REQUEST['page'])) {
                        print '"main_nav_active_item"';
                        $page = "Home";
                        $firstTime = false;
                } else {
                        if ($item == $page) { print '"main_nav_active_item"'; } else {
                                print '"main_nav_item"';
                        }
                }
                print 'href="index.php?page=' . $item . '">' . $item . '</a></li>' . "\n";

        }

        $file = strtolower($page) . '.html';
        include($file);

?>