create requestAnimFrame pollfill

requestAnimFrame.js

	window.requestAnimFrame = function(){
		return (
			window.requestAnimationFrame       || 
			window.webkitRequestAnimationFrame || 
			window.mozRequestAnimationFrame    || 
			window.oRequestAnimationFrame      || 
			window.msRequestAnimationFrame     || 
			function(/* function */ callback){
				window.setTimeout(callback, 1000 / 60);
			}
		);
	}();

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