jquery ajax problem

hi,

in asp.net 4.0 c#,

I have master page and I need to call ajax function to get some data from server, so I have this jquery function:

 

$("#save_email_db").live({
                    click: function (event) {
                        event.preventDefault();
                        var email = $('#email_newsletter').val();
                        if (IsValidEmail(email)) {
                            $.ajax({
                                type: "POST",
                                url: "MasterPageMain.master/SaveEmail",
                                data: email,
                                contentType: "application/json; charset=utf-8",
                                dataType: "json",
                                timeout: 7000,
                                success: function (msg) {
                                    var res = msg.d;
                                    alert(res);
                                    if (res == "Added Successfully!") {
                                    }
                                    else {
                                    }
                                },
                                error: function (xhr, status, errorThrown) {
                                }
                            });

                        }
                    }
                });

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now, in master page behind code (C# code) I have this function in to be called by ajax:

 

[System.Web.Services.WebMethod]
    public static string SaveEmail(string name)
    {
        try
        {
            return "Added Successfully!";
        }
        catch (Exception ex)
        {
            return "DB Error, Contact us Please!";
        }
    }

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now when I call run the code, I'm getting this error:

"NetworkError: 403 Forbidden - http://localhost:6160/leamratech4/en/MasterPageMain.master/SaveEmail"

so what is the problem, and how can I solve it