Drop Down Menu Covered up by Animated Slideshow

I'm a newbie to Dreaweaver, but I'm building my personal web page and I can't figure out why my dropdown menu (under Portfolio tab) is being covered up by the animated slideshow. I've tried using the (z-index) and that didn't work, I've also replaced the animated slideshow with a static jpeg and everything works fine. This site is a work in progress, but I want to get this figured out before I build the rest of the portfolio pages

Here's the link the test page:

http://www.rodrice.net/index_demo3.html

Here's a link to the same page without the animated slideshow

http://www.rodrice.net/index_demo3_navbar.html

Any help or tips would be appreciated.

Thanks, Rod Rice