hello - been searching for this but think my file set-ups mean other solutions don't quite work for me...

so I have a menu nav above a jquery banner, the nav has one drop-down-menu which is falling behind the banner.

been looking at z-index setting but this doesn't seem to work for me - and this is in safai and firefox, not even a ie problem!

here's the site, any help would be GREAT!
http://www.onfarmsolutions.com/