http://www.marathonproducts.com/company.html

(menu bar across the top) I thought I got this to work but after a few minutes, the menus fade away and drop behind the image. Also, if I click a link and go back, the menus don't work right. I am not good at understanding jquery and struggle with CSS. The CSS code I adapted from the SitePoint CSS3 Anthology. I added the z-index to get it to show upon top of the other elements. I don't know if this is a jquery or CSS problem. I posted at Github for joeldbirch but haven't received any reply.

Please help. Do I need to post the code?