function animation(obj, data) {

    if (obj.timer) {

        window.cancelAnimationFrame(obj.timer)

    }

    obj.timer = window.requestAnimationFrame(function () {

        for (var i in data) {

            var current=parseInt(obj.style[i]);

            var target=parseInt(data[i]);

            var speed=(target-current)/8;

            speed=speed>0?Math.ceil(speed):Math.floor(speed);

            if(current!=target){

                obj.style[i]=current+speed+"px";

                obj.timer=window.requestAnimationFrame(arguments.callee);

            }

        }

    })

}