css, layers, and NS6 positioning problems

Hi,

I'm new to this group (but not to web design, been doing that for almost 5 years, and still have lots to learn!). I hope someone can help me out...

I'm having trouble with a design, specifically a flyout menu navigation scheme. It displays fine in IE 5.5 and Opera 6, but goes "kaplooeeee" when viewed in NS6. When you mouseover a link, the submenu appears towards the bottom of the page, and not aligned with the main menu. In IE5.5 and Opera 6, the submenu aligns properly.

The site was built using DW4 and the flyout menus were done using a tutorial and extensions from projectseven.com.

I've fiddled and fixed a few things, but there is something I'm missing. The page in question is http://dizzydog.net/zoo/index.html and the style sheet is at http://dizzydog.net/zoo/style.css. The code is complex with all the javascript in there...I hope it's not too awful to wade through.

Is someone willing to take a look for me or point me in the right direction? Thanks so much in advance!

Kathy