Function.prototype.bg = function(ms){
	this.PID = setInterval(this,ms);
	return this;
}
Function.prototype.kill = function(){
	clearInterval(this.PID)
}
/*
 var a = function(v){alert(v)};
 var b = a.later(100);
 b("testtest");
 b.cancel(); // cancel
 b.notify(); // do 
*/
Function.prototype.later = function(ms){
	var self = this;
	var func = function(){
		var arg = func.arguments;
		var apply_to = this;
		var later_func = function(){
			self.apply(apply_to,arg)
		};
		var PID = setTimeout(later_func,ms);
		return {
			cancel : function(){clearTimeout(PID)},
			notify : function(){clearTimeout(PID);later_func()}
		}
	};
	return func;
};
Function.prototype.wait = Function.prototype.later;