css/js nav breaks on Mac -- please help!

I've been working on putting a css/js text navigation together which thus far has seemed to work as intended on a PC. This morning when I checked it on a mac, it broke down.

Technically it breaks down gracefully I suppose... All links are present and the nav is displayed fully expanded. The problem is that this nav is going to have hundreds of links, and having it fully expanded just isn't practical.

If anyone could take a minute to look at my css & js to see if there's something simple that I'm missing, it'd be great.

You can look at my example page here:
http://www.whitesagemedia.com/cssnav.html

All css & js is included in the ssource - no attachements.

Thank you, thank you, thank you, to anyone who can help me out.

-Chet

The original script that I started with workd cross platform:
http://www.onlinetools.org/tests/expnav.html#

Somehow, I botched it when I was tweaking it.. I cannot for the life of me figure out what I did wrong.. It no longer works on a Mac.
http://www.whitesagemedia.com/cssnav.html

Please help! I'm at a complete loss!

Works fine for me on Safari/Panther and Safari/Jaguar.