Ajax Chat modifications

I have a simple ajax/php/mysql based chat script which you can see online at [login to view URL] This is only the very start if you bid low and do a good job i will have lots more work for you. Things i need added: 1. When a user joins a chatroom we need to play the sound file sounds/join.wav. This must work in browsers internet explorer, opera, firefox and chrome. This will play without having to accept any security percautions. 2. Emoticons support - In [login to view URL] i want to be able to add emoticons for example if in a chat message i use :) we will output <img src='images/emoticons/[login to view URL]'> This must also work in topic and welcome message. 3. A send button - A send button must display after the message input form, which also submits a message. The textarea (used for messages) must also be changed to input form. 5. The text USERNAME has joined room must also be changed from USERNAME to the actual usersname who has entered the room. 6. If a user closes the browser or logs out we must display on the chatroom "USERNAME has left the chatroom as fast as possible. This must even happen if the user turns there computer off ect.