Ok,so the Java applet won't work for some reason.
The first thing I would try is a different browser. I know Macs come with a few different browsers, so give it a shot. We may get lucky.
Other wise, there are two options I see:
1. Upgrade your Java.
2. Use a separate IRC client.
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Upgrading your Java
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If you have OS9.2, click the "Download" link on the following page, and follow the instructions to update your Java:
http://www.versiontracker.com/dyn/moreinfo/macos/377This one is valid for 8.1 - 9.x:
http://tc.versiontracker.com/product/redir...J_2.2.5.smi.binOnce you've updated your Java, go to the link I sent you to before and it should work.

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Separate IRC client
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You can connect to the chat room by installing software on your own computer. Unfortunately, I know very little about Macs.
Here is a link to a range of freeware/shareware IRC clients for Mac:
http://www.versiontracker.com/php/search.p...D=macos&x=0&y=0I skimmed through the list, and this one looked decent:
http://www.versiontracker.com/dyn/moreinfo/macos/3970Once installed, you would have to set the software to connect to our server:
Address: irc.americasdebate.com
Port: 6667
Once connected, you need to join the chat by typing:
/join #chat
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Let me know if either of these are an option!
Mike