[css-d] 3 column layout with gaps

Hello, I have a page at http://www.cvmbs.colostate.edu/intech/lab2/index2.htm where I use a three column layout. In IE6 and FF 1.5.0.3 I am experiencing gaps between the middle and right columns where the yellowish background shows thru, plus I'd like all 3 columns to be the same height. Here's

[css-d] Set center column free to scroll

I created a site at http://www.dogtreatssogood.com/ based on Andy Clarke and Brothercake's Changingman Layout at http://www.stuffandnonsense.co.uk/archives/changingman_layout.html with a fixed centered column. I thought this was a really cool design but now it needs tweaked. The client wants to