Full screen - resizing issues

I have searched through the forums, and found a few full screen threads, but none really helped. I don’t have the time to search any more, so could someone help really quick?

I want to make a flash animation open in full screen, and have a background that resizes to the screen size, but another stage, with the main content, that I don’t want to resize.

If anyone could help, that would be awesome.
Thanks.

GBP