public function _update() {
			$r= new JTDocument($_SESSION['login_user_id']);
			$r->select($_POST['id']);
			$r->setFields($_POST);
			$r->update();
			$this->addAlert(new JAlert('更新完成','告知訊息',"./?action=edit&id={$_POST['id']}"));
			$this->action('edit', $_POST['id']);
		}