The chat room seems to be a JAVA Applet(ParaChat). In order for this Applet to work, computers need Sun's JRE (JAVA Runtime Environment) to function.
Here is the link:
http://java.sun.com/j2se/1.4.2/download.html
Then click on:
Download J2SE JRE and install.
NOTE: Applets are dangerous from a scum bag "Hacker" perspective. I would make sure you have firewall(Free Zone Alarm) and anit-virus(Free AVG- GrisSoft) before using this chat. I went back in the chat room after my first post, and all sorts of pops ups started appearing on my machine. I ran my Ad-Aware application and all seems to be fine for now.
I am not trying to discourage the chat, but just want everyone to be aware and safe!