CSS Menu Overlapping IE7 Issue

[ripken204]

http://www.yentiming.com/

just play around with the menu on IE7 and you will see what will happen.
i have tried messing around with z-index but i have found no success
any ideas on how to fix this?

[KDLA]

It doesn't appear at all in Firefox.....
You might take a look at these errors
http://validator.w3.org/check?verbose=1&uri=http%3A%2F%2Fwww.yentiming.com%2F

[ripken204]

i was messing with the CSS earlier and i hadnt gotten back to it. it is up now.
i saw those errors and i plan on fixing them