File Upload to a cross domain WCF service using jquery ajax

See more:

C#

ASP.NET

WCF

jQuery

Here is what I am trying to do (unsuccessfully, I might add) and would appreciate any direction you can give me

From my HTML5 site, I want to upload a file to a cross domain WCF service that is hosted in IIS 7.5.

In addition to uploading the files, I need to send additional parameters to the upload fucntion on the server

Is this possible to do?

Here is what my operationContract looks like:

[OperationContract]
    [WebInvoke( Method = "POST",
    UriTemplate = "/uploadmodeldata/?id={Id}&customerdatatype={customerdatatype}&data={data}")]
    void UploadModelData(string Id, string customerdataType, byte[] data);

Here is what my jquery ajax request

function FileVisits() {

       var uid = checkCookie1();
       userid = uid.toString().replace(/"/g, '');
       var fileData = JSON.stringify({
      Id:userid ,customerdatatype:scanupload,
           data: $('#fileBinary').val()
       });
       alert(fileData);
           "use strict";
           var wcfServiceUrl = "http://xxxxx:1337/Service1.svc/XMLService/";
           $.ajax({
               cache: false,
               url: wcfServiceUrl + "uploadmodeldata/",
               data: fileData,
               type: "POST",
               processData: false,
               contentType: "application/json",
               timeout: 10000,
               dataType: "json",
               headers:    {
                           'User-agent': 'Mozilla/5.0 (compatible) Greasemonkey',
                           'Accept': 'application/atom+xml,application/xml,text/xml',
                       },
               beforeSend: function (xhr) {
                   $.mobile.showPageLoadingMsg();

                   xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");


               },
               complete: function () {
                   $.mobile.hidePageLoadingMsg();
               },

               success: function (data) {
                   var result = data;


               },
               error: function (data) {
                   alert("Error");
               }
           });

   }

if file size is less then 100 kb this error occurred

> Method not allowed

but if file is greater then 100 kb this error occurred

> 413 Request entity to large

How can I upload a file from jquery ajax to cross domain wcf.
Thanks