What the OP wanted was to be able to scroll up and down the forum page without the friends bit disappearing off the top of the screen, that's why I suggested two separate browser windows.
The reason why you don't see the friends area in both the browser windows in my picture above is because I have disabled flash and refreshed the larger browser window to get rid of the flashing thing, and yes, the other browser window with the friends list will work okay provided I don't refresh it.
⇩ EDIT : Not quite sure how that helps BD but thanks for posting. : ) ⇩