I am using a "popup" to show a video in. That's because I don't want to obscure the remainder of the page. That way people have something to read, (my ads), while the video is loading. Once the load is complete, they can, and do enlarge the window, sometimes to full screen. The only real problem the space wasted by the window "jazz', such as the status bar in firefox. What I would love to have, is a frame that is resizable by the user via a drag action in the lower right corner. Any ideas?
How do you open the popup? If you use javascript see this: http://www.w3schools.com/HTMLDOM/met_win_open.asp. The "specs" parameter does what you need.