Chatbox Server

I have a chatbox which is at the url: [login to view URL] login username: viewer password: viewer123 you will then be asked for another login which you can enter any name as a guest. Once logged in you will see a chat window, where you can move your chat character around and type text. I need this altered so other users online can see each other, and see each other chatter move and chat. It needs to be fast and use less server resources as possible. It needs to also display users entering and exiting. You will also notice when moving the chatter it slowly moves in an animation. I want this removed so when you move your user it instantly moves to that position. It also needs to work in ie, chrome and firefox and opera I do not want the messages to use mysql database, i would like a server written to transfer messages and avatar movements and can be used in windows and linux. Please choose a server language and explain what you will do. This is only 1 stage of work, i am looking for someone to keep working on this project after completion.