I was thinking about this also, how to accomplish this, and thought it might be difficult and with some issues in certain situations.
What I am trying to do now is the following: to place the call to a specific cform in a special page template without any other elements. Then the plan would be to call this page using Highslide excluding page controls including the top and bottom of the browser.
This is unproven, but I know with Highslide you can produce a web page in a pop up mannor.
Any thoughts?
Jeff