Updated requestAnimationFrame pollyfill

rAF2.js

var lastTime = 0,
	currTime,
	timeToCall,
	id;

window.requestAnimationFrame = window.requestAnimationFrame ||
	window.webkitRequestAnimationFrame ||
	window.mozRequestAnimationFrame ||
	window.msRequestAnimationFrame ||
	window.oRequestAnimationFrame ||
	function (callback) {
		currTime = new Date().getTime();
		timeToCall = Math.max(0, 16 - (currTime - lastTime));
		id = window.setTimeout(function () { callback(currTime + timeToCall); }, timeToCall);

		lastTime = currTime + timeToCall;

		return id;
	};

window.cancelAnimationFrame = window.cancelAnimationFrame ||
	window.webkitCancelAnimationFrame ||
	window.mozCancelAnimationFrame ||
	window.msCancelAnimationFrame ||
	window.oCancelAnimationFrame ||
	function (id) {
		window.clearTimeout(id);
	};