limit the rate of firing for a function

rateLimit.js

	function rateLimit(func, time){
		var callback = func,
				waitTimeout,
				waiting = false,
				context = this;
		var rtn = function(){
			if(waiting) return;
			waiting = true;
			var args = arguments;
			waitTimeout = setTimeout(function(){
				waiting = false;
				callback.apply(context, args);
			}, time);
		};
		return rtn;
	}