You should have it compatible on both. The majority of people using the web use IE. However, it's not that bad. All you really have to do to fix it is (I beieve):
1) increase the padding around entries. 2) decrease the width of the header boxes.
If you're still having trouble with it in a day or two (when I won't be doing finals), I'd be happy to help you with it. Just remind me via e-mail or another comment.