Is this possible using CSS only? I can't find a definitive answer anywhere!

It's for a left and right nav bar I'd like to stretch to 100% height; i.e. the end of the page. There are three floated columns contained within a floated container that stretches 100% height, I just can't get the childs to stretch...

<http://www.dev.inside-guides.co.uk/brentwood/pages/links.html>

Thanks in advance for any replies.