public static function connect()
 {
     if (!SessionHandler::$connected) {
         SessionHandler::$connected = mysql_connect('localhost', 'DATABASE_USER', 'PASSWORD');
         mysql_select_db(SessionHandler::$db);
     }
     if (!SessionHandler::$connected) {
         header('HTTP/1.1 503 Service Unavailable');
         echo "\nConnection failed!\n";
         die;
     }
 }