Stretching just the background of a swf to the screen

Hi all

I searched on this, but there was a lot of conflicting info. Aside from the fact it dealt solely with stretching the entire swf.

I have my main body of nav/content, which I want to stay in the center of the screen. However, I also have a background gradient - I want this to stretch to the users browser window.

Anyone able to shed some light?

Cheers