async script

gistfile1.js

var callback = arguments[arguments.length - 1];
var any_activity_yet = false;
var checkInactive = function() {
	var result = (window.jQuery != null) && (jQuery.active === 0);
	if ((result == true) && (any_activity_yet == true))
	   {return callback();}
	if (result == false)
	   {any_activity_yet = true;}
	setTimeout(checkInactive, 250);
	}
checkInactive();