<script type="text/javascript">
    function $(id) { return document.getElementById(id); }var timer = null;
    var speed = 60;
    var div1 = document.createElement("div");
    div1.id = "demo1";
    var div2 = document.createElement("div");
    div2.id = "demo2";
    function fnval(obj) {//我现在想做一个鼠标移上向上滚动的效查当鼠标onmouseover 去执行fnval的时候动态的加载这个
      //下面这俩个div，做滚动效果，可是我要怎么去判断如果是当前就显示不是就不显示
        $("productlist").appendChild(div1);
        $("productlist").appendChild(div2);
        $("demo1").innerHTML = obj.nextSibling.innerHTML;
    }

        var demo = $("productlist");
        var demo1 = $("demo1");
        var demo2 = $("demo2");
        demo2.innerHTML = demo1.innerHTML;
       function scrollProduct() {
        demo.scrollTop++;
       }
    timer = setInterval(scrollProduct, speed);

</script>