Run this code and point all your buds to the URL, then take witness to the heart-pounding excitement of chatting! Moving your mouse around also moves your dot, bubble and input box. Be the last of your geekbuds to sign in and your z-index will rule them all.
Tested on Chrome. Not sure if it works in FF. Also, sorry about client.js ... I kind of butchered it :-P
Original code from @fjakobs. Thanks Fabian!