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HTML and layers

Okay, I have a very simple question for you guys...I know this is obvious, but my brain is on vacation today.
I have a weblog here. It has the journal content in one frame, and on the right is a 'link' frame; you'll see what I mean.

How do I set this center frame to resize according to browser window size, so that at smaller resolutions it doesn't shove the left frame down another line?

(setting the 'width' property to auto hasn't worked, it then expands clear off the browser's window, when there's a lot of text in it.)

Many thanks in advance.