title: Jquery Ajax JSONP error not firing
body: <p><pre>
  error not firing. but its showing on firebug
  HTTP 500 error :
  jQuery15105771912402844872_1324698623378({"Message":"Master Order \u0027MS1100014\u0027 customer name not provide.","StackTrace":"   at SimWeb.SimWebGuard.APICheck(String Token, String PublicKey, String ServiceName, String ServiceParam) in D:\Documents\Visual Studia 2010\Project\SimWeb\SimWeb\API\SimWebGuard.asmx.vb:line 249","ExceptionType":"System.Exception"});</p>
  
  <p>jquery version 1.5.1</p>
  
  <p></p>
  
  <code>$.ajax({
      crossDomain: true,
      cache: false,
      type: "GET",
      url: _url,
      data: _data,
      dataType: "jsonp",
      contentType: 'application/json; charset=utf-8',
      success: if_complete,
      jsonp: "callback",
      complete: function (requestState) {
          basicjs_ajaxCounter = basicjs_ajaxCounter - 1;
          $(".AjaxStatus").html("&lt;img src='" + basicjs_ajaxLoadingImg + "' /&gt; Working " + basicjs_ajaxCounter + " request(s)...");
          if (basicjs_ajaxCounter == 0)
              $(".AjaxStatus").hide();
      },
      error:function (xhr, ajaxOptions, thrownError){
                  alert(xhr.status);
                  alert(thrownError);
      } 
  });
  </code></pre>