Breaks in IE6?

I (unfortunately) played with the css and js and created a great mod of this menu for my site... In firefox, the menu looks and works great, but in IE6, the third-level items break off from the menu and second-level items (that have a corresponding third level) are greater than the defined height (or line-height). IE also seems to add or increase the borders and is just... generally messed up.

I removed my mod of simplemenu, inserted the latest module, and found that I had the same problems. I've deleted my cache and cookies and accessed the site from different systems running IE6 with the same result.

I am attaching a screenshot (not my actual theme but I get the same result regardless of theme).