Chat Client i

We are looking to have a chat roon that our members can enter through our site and interact. we wish to have a programme or chat client that allows us or the users to attach/assign sounds/wav files to certain words , or even maybe emoticons. We can pre set the words and sounds - so if i were chatting with someone in a chat room - i can use and send certain words and these words when they arrive on the other persons computer will emit a sound or sounds. It will need to be quick and effecient