Suckerfish in IE, third level positioning

I have a new suckerfish-based menu on http://www.radford.edu/jcharris/nav2.html that I'm trying to get correct.
Looks great in every browser except IE 6 (go figure). In IE, the third level appears pretty far to the right & above of where it should be.

I'd appreciate any insight that anyone has on a fix for this! For a variety of reasons, we're trying to move all of our DHTML/Javascript menus to CSS based flavors.

Thanks.
-jon