Cross-browser-ness -- or, I hate IE

Having difficulty getting a page I'm working on to display correctly in IE.  Works perfectly in Firefox, barely close in IE.

It's supposed to have a bar across the bottom of the window, a small div that looks like a button, and a menu popping up from the button on mouseover.  A number of other buttons are lined up to the right of the menu button.  Yes, it strongly resembles a taskbar.  As I said, everything functions exactly as I desire in Firefox (I'm running 0.9.3) so run that if you would like to know how I'm looking for it to show up.

In IE, the styles seem to largely be ignored for the button and <ul> that makes the menu.  It seems the "a#gufButton ul" rule is completely ignored by IE.
I have used an <a> as the element to render my button, because if I remember correctly IE only supports :hover on <a> tags.  If it can be just a div, that would be superb.

Code is at: http://www.arantius.com/ee/guffaw2.html as well as the two .css files referred to in it.