This page is designed to use web standards. You are using a browser that does not properly handle these standards. The website will work properly (it just won't look so hot) so you should consider upgrading. Any modern browser should work fine (Safari, Mozilla, IE, etc.)
Visit the Web Standards Project for more information.
I have written an opinion piece on my main website entitled:
It covers why I have chosen to use the accepted web standards even though they seem not to be very well accepted. This is probably a topic many of you feel strongly about, so here is a place to let your feelings be known and rip my arguments to shreds. Time to belly up to the bar!