Ajax with custom Form Authentication in MVC3 project

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Ajax

MVC3

authentication

Hi,

I have an MVC3 project with custom form authentication.
I got the authentication to work fine (I used the "HttpContext.Current.User.Identity.IsAuthenticated" property in order to make sure it worked)

I use on my of my forms an Ajax:

$(document).ready(function () {
        $.ajax({
            url: '/MyPages/MyControllerFunction',
            type: 'POST',
            success: function (result) { $('#MyJavaTemplate').tmpl(result).appendTo('#MyHtmlTable'); },
            error: function (result) {
                $('#errorDisplay').html(result.responseText);
            }
        })
    });

When I get to this page (and the ajax should call this controller's function) I get this error:

HTTP Error 404.0 - Not Found
The resource you are looking for has been removed, had its name changed, or is temporarily unavailable.

It only happens to me with mhen I call the controller's function through ajax. Before I changed my program to work with form authentication, It all worked. It's as if the user is not authenticated (even though it is)

What should solve this problem?

Thanks