flash player keeps exiting fullscreen?

When I am watching nba broadband and hit "fullscreen", of course the game goes to fullscreen. I want it to stay fullscreen. But since I use three monitors, if I do any mouse activity at all on one of the other monitors, the game monitor exits fullscreen. Hopefully someone can tell me how to keep it fullscreen. I have tried ie7, firefox, and avant. I cannot seem to find the url that would work with vlc player