hey guys

I'm trying to develop a website that doesnt scale the menu or the information inside it but scales the background behind it to fit your browser size.

something similar to http://www.cuttingedge.com.au

notice how the background gradiant can be resized, however everything else maintains its proportions.

What I'm trying to do is get a background animation that appears on the website that can be resized to the browser size but have a field, or layer, or movie clip (if i have to) that keeps its original proportions.

So thats a background that changes size with browser resize
and a foreground that, though it isnt static, maintains original proportions.

Thanks for your time, any help is greatly appreciated.