I'm trying to redirect the user if they login successfully but the code I have on my page seems to be preventing the redirection from working. If I remove the jQuery below the redirection works. Can somebody tell me tell me if there's something I'm doing wrong? Thanks

I have the following Action:

[AcceptVerbs(HttpVerbs.Post)]
        public ActionResult Login(User user)
        {
            var myErrors = new Dictionary<string, string>();
            try
            {
                if (ModelState.IsValid)
                {
                    if (userRepository.ValidUser(user))
                    {
                        return RedirectToAction("Index", "Group", new {page = (int?)null});

                    }
                    else
                {
                        return Json("Username or password seems to be incorrect");
                    }
                }
                else
                {
                    foreach (KeyValuePair<string, ModelState> keyValuePair in ViewData.ModelState)
                    {
                        if (keyValuePair.Value.Errors.Count > 0)
                        {
                            List<string> errors = new List<string>();

                            myErrors.Add(keyValuePair.Key, keyValuePair.Value.Errors[0].ErrorMessage);
                        }

                    }
                    return Json(myErrors);
                }
            }
            catch (Exception)
            {
                return Json("Invalid");
            }

        }

and the following code on my page:

<script language="javascript" type="text/javascript">
    $(document).ready(function() {
        $("#SaveSuccess").hide();
        $("#btnLogin").click(function() {

            $("form").submit(function(event) {
                var formData = $(this).serialize();
                $.post($(this).attr("action"), formData, function(res) {
                    ShowErrors(res); 
                    if (res == true) {

                        $("#SaveSuccess").text("Saved");
                    }
                    else {
                        $("#divError").html(res);
                    }
                    $("#SaveSuccess").fadeIn(100);
                }, "json");
                return false;
            });
        });
    });
</script>