Javascript question...

Hi, I know this is a PHP list but i thought someone might be able to help me out. I was looking at the Levi's website the other day and i noticed a cool script on there for opening pop-ups. They have managed to get rid of the usual window borders altogether and it looks really good. They have managed to do it by opening the pop-up window in full screen mode and then making the window smaller and positioning it in a certain place on screen. I've figured out how to open it, shrink it and position it but for some reason i the scroll bars are always there. The levi's site has no scroll bars. Does anyone know how to get rid of the scroll bars? Thanks in advance, Phil