public static function getLocations($agentId)
 {
     $criteria = new CDbCriteria();
     $criteria->condition = 'agent_id=:agentId';
     $criteria->params = array(':agentId' => $agentId);
     $result = UserAgentLocations::model()->findAll($criteria);
     if ($result) {
         return $result;
     } else {
         false;
     }
 }