Thanks for the info, we'll look into this. At first glance, we think the fix should just be a matter of minor modifications to some selectors.
I just downloaded Netscape 8.1 (nice browser so far, using it right now) installed it and ran it against my local. I don't see the issues you seem to be having. Can you be more specific about which version of Netscape is giving you trouble? I tested Nphalanx and all of the other themes (i have 9 at the moment), and i can't replicate the problem you've described... is it Netscape 6?
I just checked it again today in Netscape 8.1 after performing a reboot on the JBoss application server. It seems to be working fine now. I had been making mods to the portal pages through Content Manager so that's probably what caused the Netscape problems. I was having the problems with both Netscape 8.1 and 7.1, IE was ok.