Drop-down menu disappearing in Internet Explorer only with slideshow

Question

I'm hoping someone can see what I'm not seeing here:

http://bit.ly/crosschurch

The horizontal menu at the top has drop-down items, and it works fine in other browsers on this page, and all browsers on other pages. But in Internet Explorer, on this page with the slideshow, the menu disappears unless you move really fast. I've tried different CSS solutions but nothing's worked so far.

Can anyone please suggest some fixes?

Thanks!