Would setting position:relative and increasing z-index work?

Haven't tried, but just as an idea.

As for the slight shifting-down observed in Firefox, the "border-bottom" in gumax_droppy.css #gumax-nav li.hover a, #gumax-nav ul li, #gumax-nav ul li a { background-color: #5e5a5a; /* drop down background */ border-bottom: 1px solid #777;} must be responsible. Actually, this issue becomes...

The solution I can come up with is going to be pretty ad-hoc, but I hope it works. First of all, I'm assuming you use GuMaxDD 1.1, because you're speaking of level-1 links, and 1.2 and later does not seem to create links at level-1. (If you're watching, Paul, I actually liked it the old way. How abo...