Java avatar chat problem

I have a custom made java avatar chat, with the full source.? I am looking for a coder to fix a bug and install an addon. The bug: When a user switches chatrooms other users dont see you user dissapear only when they send a message, this needs to be fixed so the user dissapears automatically. The addon: When a user switches chatrooms i want the java applet to automatically update the mysql database in the onlineusers field to the room they have joined and when they exit the chat i want it to delete the field. There will be alot more work in the future if you choose to accept.