Using $.ajax with a REST service that is built with WCF

$.ajax({
     url: "http://localhost/restservices.svc/Document",
     type: "POST",
     data: '{source: "New York", type: "PDF"}',
     contentType: "application/json; charset=utf-8",
     success: function (message) { alert("success: " + message.status); },
     error: function (message) { alert("failure: " + message.status); }
});