open a popup from a portlet webapp

Hi:)

I hava a small webapp (a voting tool) which works quite well as Jahia
portlet, within some Jahia page. This webapp has some adminstration pages -
for add/edit/delete votes - which need more space than the regular end user
views. So I want to run these maintenance pages within a popup of my
portlet. I wonder if there is an easy way to do this, my first experiments
dont look do't look like this.

The problem is that the Jahia response.encodeUrl() wrapper,  which I have
to use for all portlet urls, will always generate a url for the complete
Jahia page, but in my popup I want to show only the portlets content and
not the surrounding page content.

Does anyone has any experience or tips?
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kind regards
Wilhelm