Reverse AJAX

Yes yes, we all know AJAX is the rage, right J? :) However, this is something I've been advocating for a while. Current AJAX is all about using JavaScript as the client side, to fetch data via XML or to directly call the server code, be it Java or Python, Ruby, or even php. I've wanting an two way solution for sometime. Namly, to be able to call the Javascript code from the server side. Well, here it is.