Align footer at very bottom?

[sebaot]

There's a problem with the vbulletin, and you can see it on this site if you click "chat". I've got the same problem. I've got a similar layout with a background that has a white blank space in the middle. The footer will align at the very bottom on pages where you have to scroll down.

However, when a page covers just half the screen, the footer comes up there halfway down the screen. Not at bottom. I tried setting min-height to 100% and using position absolute and bottom 0 to work around this. Unfortunately, when I opened a page that had to scroll, the footer was of course on top of the content but bottom of browser window.

Is there a way to solve this or am I better off forgetting about it? :-)