5
or maybe you can try 123flashchat
It is a Java chat server with a Flash chat client. It's a way to host and manage real-time communication. 123 Flash Chat server software can integrate existing databases for forums or websites. It's customizable for admins and end-users.
With the chat module for XOOPS CMS, you can embed a real-time chatroom with XOOPS database integrated into your website.
Once logged in Xoops, users don't have to re-enter their username or password again to access chat.
Online Chat Demo
http://www.123flashchat.com/demo.html
You can select skins and languages.
