If you go to the main, active site,
ASI Interiors - Basement Development, Bathroom Renovations, Hardwood Floor and Installation, you will see that in all browsers the CSS dropdown menu works as it should. When you go to the KB, you can see that it doesn't work in IE7 (I cannot test other versions since Vista doesn't allow MultipleIE to run - yet). But the menu works fine in FF.
As for the overflow, if you look at it in IE7 you will see the Wrapper box (defined by the black border) is shifted over on the right side. It should only be as large as the header image but instead there is a a 1/2" gap there and also at the bottom where the footer is. This is being pushed out due to the middle portion of the KB program (I am assuming?). So maybe "overflowing" is not the best way to describe it. Maybe better to say pushing the bounding box (Wrapper DIV) out.
Won't let me post a screen shot. but let me know if you are seeing the same "gap" on the right side of the header and footer.
Thanks