My menu is disappearing??

Hi there,

I’m currently building a site and my latest problem is the following:
I have position; fixed on the menu, so it holds at the top of the page,
but i’m also using a slide show and when the menu is over the image and the slide show is used….it hides the menu.

http://thisisharrington.com/wordpress/latest/

any help would be much appreciated;

thanks!