public function actionDeleteLectureCat()
 {
     if (empty(Yii::app()->user->id)) {
         $this->redirect(Yii::app()->createUrl(""));
     }
     $idLecturecat = $_REQUEST["idtestcat"];
     if (WLectureCat::DeleteLectureCat($idLecturecat)) {
         echo json_encode(array("result" => "true"));
     } else {
         echo json_encode(array("result" => "false"));
     }
 }