I need a liquid layout with a fixed header and footer, a 200px left side nav, and a scrollable content area. FF3 and IE6 compatible (unfortunately).
I've been googling around, but nothing seems definitive and up-to-date.
What you've described sounds easy enough... Here's an article about getting around some of the problems with
position:fixed in Internet Exploder 6: http://ryanfait.com/position-fixed-ie6/
it sounds an awful lot like your client wants an old-school frameset style website. advise them out of it! it's generally not recommended to take up screen real estate with header AND sidebar AND footer all the time.