[Zope] reloading a pop-up box

This is probably outside the scope of this discussion forum but perhaps someone has some experience with this. I have a dhtml pop-up box that contains a form that calls a dtml method that calls a python script. I notice that I can't seem to reload only the content within the pop-up box. I have been using this <dtml-call expr="RESPONSE.redirect(URL1 + '/index_html')"> but would rather reload the box and not the whole page. Any ideas?