make ajax call to wcf service using javascript

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WCFServices

I have build WCF Rest service and i am trying to call it from javascript.The method gets called properly when invoked directly from browser however nothing happens when i call it using javascript.

[WebGet(
       ResponseFormat = WebMessageFormat.Json,
       BodyStyle = WebMessageBodyStyle.Wrapped, UriTemplate = "convertcadtoimg")]
       [OperationContract]
       string convertcadtoimg();

jQuery.support.cors = true;
       $.ajax({
           type: "GET",
           url: "http://localhost:2881/RestServiceImpl.svc/convertcadtoimg",
           //data: { domain: domainName, website: sitename },
           dataType: "jsonp",
           contentType: "application/json; charset=utf-8",
           success: function (data) {
               alert('success');

           },
           error: function (jqXHR, textStatus, errorThrown) {
               alert('error');

           }
       });