public function notification($message, $classes = 'notifyproblem')
 {
     $message = clean_text($message);
     if ($classes == 'notifyproblem') {
         return bootstrap::alert_error($message);
     }
     if ($classes == 'notifysuccess') {
         return bootstrap::alert_success($message);
     }
     if ($classes == 'notifymessage') {
         return bootstrap::alert_info($message);
     }
     if ($classes == 'notifymessage') {
         return bootstrap::alert_default($message);
     }
     if ($classes == 'redirectmessage') {
         return bootstrap::alert_block_info($message);
     }
     return bootstrap::alert_default($message);
 }