Someone

<?php require('config.php'); ?>
        <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html>
<head>
 
        <link rel="stylesheet" href="./style.css" type="text/css">
        <title><?php echo $config['sitename']; ?> - <?php echo $pagename; ?></title>
        <meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1" />
</head>
<body>
<a href=index.php><img src="images/logo.png" alt=""/></a><br />
	<center><b>Main Menu:</b> <a href=index.php>Home</a></center><br />
<?php
        if (isset($_GET['page']) && file_exists($_GET['page'] . '.php'))
                $page = $_GET['page'];
        else
                $page = $config['default_page'];
 
        include('pages/' . $page . '.php');
?>
</body>
</html>