I wonder how that web site looks like in Netscape 4?
I guess it's just been second nature to me, since I've always tried to create web pages that are cross-browser compatible. Here at the "randompsycho computer lab," I run PC IE versions 2, 4, 5, Netscape 4 and 6; Mac IE 5, Netscape 4; Unix Netscape 4 and Lynx. Heck, if you can design a web page that looks half way decent in IE 2 and Lynx, you've accomplished something [big grin].
For a good introduction to design testing, check out this article:
WebmasterBase - Step-by-Step Web Testing