Shoutbox

Hi! There is a script that sends login toasts to all contacts. But when I want to joke with a contact, many of my other contacts says "Stop!" to me. So I want a script as block all contacts apart from the one I'm talking with, and then do the same thing as the script Toastspammer. Can someone do this?
//Anton

I think HopperLive can do this: http://shoutbox.menthix.net/showthread.php?tid=62563&page=1