overruling an applet?

I'm using a sigmachat chatroom and the free service won't allow you to add accounts with passwords to it. I don't want my chat users to be able to constantly change ther names and not be identified for who there are. Is there some way I can set up a password gate that will insert their username as the username for the chat? Sigma Chat (http://www.sigmachat.com)

javascript can not force a server-side application to act otherwise than originally was built for. Try put this question in the server-side application forums.