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

// clearAnimation
clearAnimation = (function(){
	return window.cancelRequestAnimationFrame
			|| window.webkitCancelRequestAnimationFrame
			|| window.oCancelRequestAnimationFrame
			|| window.msCancelRequestAnimationFrame || function(id){
				clearTimeout(id)
			}

})();