nav menu styling not working

Any idea why my nav menu background colors and rollovers aren't working properly? I've checked in the database with phpMyadmin and the right values get put there. But the end result doesn't show up in a browser. Does some part of the database need to be purged? Let me know if you have any ideas. I've used css inserts in the past, but I removed all of that extra formatting, and the menu still won't behave.

www.georgedesign.com