Background image not showing

Hello,

I have been building a new theme. There is one question I can’t seem to figure out a simple css problem. I am trying to set up a couple menus with some background images. Some with roll over/hover state with images. The images are not showing up properly..

I checked the overflow it is set to visible on all links.

I can’t figure out what I am missing ..

here is the site : http://thepeacemakers.ca/