I have used the mouseenter from Mootools for a dropdown menu and am having a problem in IE7. The dropdown goes over top of links that are below them but you can still see the links below making it hard to click on the links in the dorpdown. Check it out on http://brooklynbusinesscenter.com/ the "Community" button on the top nav. Any help would be very much appreciated. This site is live and this is not good.

Thanks in advance.