IE 7 Problem displaying my menu correctly

For some reason FireFox displays my menu perfectly on my site but when it comes to IE 7 it messes it all up. It adds in extra rows where there should be nothing and dose not diplay things until you go over top of the menu. I thoght it was just my computer but went to someone elses house to day. Someone who has never been to my site before and they have the same problem. So I know it's an IE thing. Any idea what I can do to fix the problem?
Thanks.

http://robinsden.co.cc

why do you have a div id of myslidemenu when u dont have an attribute to match. That maybe your problem you have a div ID and a div Class for the same navigation. so try removing myslidemenu.