public function multimodifyAction()
 {
     $objReport = new Questionanswer_Model_Report(array());
     $id_arr = $this->_getParam('id', null);
     if ($this->getRequest()->isPost()) {
         try {
             foreach ($id_arr as $id) {
                 $objReport->deleteReport($id);
             }
         } catch (Exception $e) {
             throw $e;
         }
         return $this->_helper->redirector->gotoRoute(array('action' => 'viewreport'));
     }
 }