I've been trying to solve this for sometime now and I can't seem to get it.
On the left hand side of this page (http://test.eyecravedvd.com/new/test.htm) I'm attempting to join the left bar to the footer regarless of the length of the left bar. Right now in the css file (http://test.eyecravedvd.com/new/style.css) it's set to 900px, but it will be set to auto in the final product. (the left bar code is grabbed from other templates and the database) same for the right side, but there will be many occassions where the center block will be extended beyond either.
The colors are just temporary to help me work the layout out.