window.requestAnimFrame = (function(){

    return  window.requestAnimationFrame ||

        window.webkitRequestAnimationFrame ||

        window.mozRequestAnimationFrame    ||

        window.oRequestAnimationFrame      ||

        window.msRequestAnimationFrame     ||

        function( callback ){

          window.setTimeout(callback,  / );

        };

})();

window.cancelAnimationFrame =(function(){

    return window.cancelAnimationFrame ||

        window.cancelRequestAnimationFrame ||

        window.webkitCancelAnimationFrame ||

        window.webkitCancelRequestAnimationFrame ||

        window.mozCancelAnimationFrame ||

        window.mozCancelRequestAnimationFrame ||

        window.msCancelAnimationFrame ||

        window.msCancelRequestAnimationFrame ||

        window.oCancelAnimationFrame ||

        window.oCancelRequestAnimationFrame ||

        window.clearTimeout;

})();