Two things to know about.
1. This is the mIRC Support Forums. We support mIRC and no other client.
2. Flash has a security access limiting sandbox. Unless the IRC server exists on the very IP address of the web server you are hosting from, you will not be allowed to connect to that server. Eg: If you're hosting the Flash IRC Client on a
www.geocities.com website, the IRC server MUST be irc.geocities.com and nothing else.
Take care.