/**
  * @param $bannerId
  * @return String
  */
 private function getAccountIdFromBannerId($bannerId) {
     $banner = new Pap_Db_Banner();
     $banner->setPrimaryKeyValue($bannerId);
     try {
         $banner->load();
     } catch (Gpf_DbEngine_NoRowException $e) {
         throw new Gpf_Exception($this->_('Banner with id %s does not exist.', $bannerId));
     }
     return $banner->getAccountId();
 }