public function performFormAction()
 {
     $result = array();
     if (check_RequestMethod()) {
         if ($this->checkData($_POST)) {
             if ($_POST['id_user'] == "new") {
                 $user_data = usersModel::getUser("login_user = '******'login_user']) . "'");
                 print usersModel::createUser($_POST);
             } else {
                 usersModel::updateUser($_POST);
             }
         } else {
             $result['errors'] = usersModel::$errors;
         }
         set_Json_header();
         print json_encode($result);
         exit;
     } else {
         _404();
     }
 }