Upload a file through an iFrame

Anybody here have any experience uploading a file via a hidden iframe
for
that “ajax fresh good feel”? Previously I was using the plugin
form_remote_plugin
(http://svn.kylemaxwell.com/form_remote_upload/trunk/)
which was working like a dream until our sys admin updated rails to
1.1.2.
I’ve made a form that can submit the file to an iframe, but now I’m
having
trouble with my rjs template not being able to access div’s on the main
page. Any pointers would be appreciated.

thanks,
Rob