window.requestNextAnimationFrame = (function () {
	var self = this;
	return window.requestAnimationFrame       ||
				 window.webkitRequestAnimationFrame ||
				 window.mozRequestAnimationFrame    ||
				 window.oRequestAnimationFrame      ||
				 window.msRequestAnimationFrame     ||
			function (callback, element) {
				var start, finish;
				window.setTimeout(function () {
					start = +new Date();
					callback(start);
					finish = +new Date();
					self.timeout = 1000 / 60 - (finish - start);
				}, self.timeout);
			};
})();