Jquery.form with input type="fileupload" not executing success handler

Jquery.form with input type="fileupload" not executing success handler

Hi I'm using jquery.form.  I'm submitting a form with an input type ="fileupload" on it.  This causes the fileUpload function in jquery.form to fire.  However, the options.success function never gets fired.  so my custom success function doesn't get fired and instead of incorporating the json result into the page it saves it and displays it in notepad.  
I see the $.event.trigger("ajaxSend", [xhr, s]); line get fired, and the var s seems to have all the options in it.  then form.submit() gets fired and that's it.  No success handler.
I'm not sure if "ajaxSend" actually does anything if you don't call $.ajax.  which the fileupload function never does.  It calls form.submit() but not $.ajax so perhaps this is why my success handler isn't getting fired.
Any help would be greatly appreciated
thanks
r