public function actionDeleteAll()
{
$ids = $_REQUEST['ids'];
$crit = new CDbCriteria();
$crit->condition = "id IN ({$ids})";
SystemUser::model()->deleteAll($crit);
Yii::app()->user->setFlash('success', "Ðã xóa thành công");
$this->redirect(Yii::app()->request->urlReferrer);
}