Wicket and javascript

Hi,

I know there has been some topics on this but I need some pointers on how to
manage this.

I have struggled with the uploadProgressBar for some time but it fails for
all browser. I've decided to create my own upload with progressbar.
It's a html form that post to an IFrame. On post I upload to a servlet. I
can do ajax callbacks to the servlet to see the upload status.

What I want is to when the upload is finished call back to wicket so I can
refresh the file list via ajax. Is this possible? Any pointers?