mvc返回值,该怎么解决

mvc返回值
mvc3中 返回的时候能返回个窗口吗
    

     public ActionResult Add(BuyerEmployeeDTO model)
        {
            if (ModelState.IsValid)
            {
                BuyerEmployeeDTO sellerModel = (BuyerEmployeeDTO)SystemUser.SellerGetUser().Model;
                model.BuyerId = sellerModel.BuyerId;
                if (model.Account == sellerModel.Account)
                {

                    return Content(Message.Show(PlatForm.AccountYes,PageName.BuyerEmployeeAdd));
                }
                else
                {
                    ReturnMessage rm = _interfaceace.AddBuyerEmployee(model);
                    if (rm.IsSuccess)
                    {
                        return Content(Message.Show(PlatForm.AddSuccess, returnUrl));
                    }
                    else
                    {
                        return Content(Message.Show(PlatForm.AddFailure, PageName.BuyerEmployeeAdd));（我就是想在本页面弹出个窗口，可是每次都跳了出去）
                    }
                }
            }
            else
            {
                InitModel(model);
            }

我是新手  可能说的不是很清楚。。。。
------解决方案--------------------------------------------------------
那要用客户端脚本，和ASP.NET MVC没有任何关系