IRC has 2 servers:
services.antionline.com
antichat.cmu.edu

The java page loads through services.antionline.com. If you connect through mIRC, trillian, etc, you normally point at irc.antionline.com. irc.antionline.com will send you to whichever server has a smaller load. services.antionline.com is probably down, and everyone in chat is using antichat.cmu.edu. The java page is supposed to go to cmu if ao is down, but doesn't always do it.