To integrate group functionality in chat box

[login to view URL] Check this script. It has all the thing that I need except group chats. So I want to integrate this group chat functionality in this same as skype. Please see its live demo and preview and let me know if you can do it for me. I am also interested to implement audio and video calling in it same like skype. If you are also able to do that, let me know. You can give me overall estimation for it if you can do that.