private function crawler_detect(){
    $crawlers = array(
      1 => array('name'=>'Yandex','code'=>'Yandex'),
      2 => array('name'=>'Google','code'=>'Google'),
      3 => array('name'=>'Rambler','code'=>'Rambler'),
      4 => array('name'=>'Yahoo!','code'=>'Slurp'),
      5 => array('name'=>'MSN','code'=>'msnbot'),
      6 => array('name'=>'Alexa','code'=>'ia_archiver'),
    );
    for($i=1;$i<7;$i++){
      if(preg_match('#(.?)('.$crawlers['code'].')(.?)#',$_SERVER['HTTP_USER_AGENT'])){
	return true;
	$this->crawler_name = $crawlers['name'];
	break;
      }
    }

  }