Help me fix this DIV height problem!

Hello,

The following is the main page for a site I’m working on: LINK

I can’t make the left menu spacer to work. Basically, I made a DIV at the bottom of the last button (div id=“stem”), and I’m trying to make it fill the rest of the height of the column. It doesn’t want to work though, and I have no idea why.

I tried making the height of the “stem” DIV 100% and a bunch of other things, but they all act funky and none does what I want.

Note: Open the link with Firefox. The page doesn’t look right at all in IE (I don’t care for IE right now).

I hope I have explained my problem clearly enough. If you click a few of the links to the left, you will see what I mean by the menu spacer not behaving correctly.