public function loginCheck()
 {
     $User = new UserModel();
     $loginArray['username'] = $_POST['username'];
     $loginArray['password'] = $_POST['password'];
     $result = $User->loginCheck($loginArray);
     if ($result['status']) {
         $_SESSION['username'] = $loginArray['username'];
         $_SESSION['userid'] = $result['userid'];
         $_SESSION['userlevel'] = 0;
         $this->ajaxReturn($result);
     } else {
         $this->ajaxReturn($result);
     }
 }