Can someone help me write this script for adium?

[SillyBilly]

You know that how Adium allows you to have multiple logins? Well, say i have 30 of my screenames in a chat in AIM through adium. but theres 1 person in there (Not me) I want a auto filler script. what i mean by that is like, whenever a person leaves a certain aim chat, one of my screennames from adium will enter the room. and eventualy all the people in the room will leave and the auto filler will fill the room. So tecknicly just a script that makes one of my signed on screenames enter a chat im in whenever somones leaves.