Resizing to Screen setting and setting defined postitions

I’ve been looking at a lot of new flash sites out that look like they use a frame based website in flash but its a full flash website with no scroll bars in the browser everything stays at the same position no matter how big your browser window is. I was wondering if they were just using frames or if their was a action script i was missing out on that could make this work for my projects.

Thanks
Versus Media Group