随鼠标上下滚动的广告条

方案一：有的浏览器会无限制往下

<script language="JavaScript">

<!--
        lastScrollY = 0;
        function heartBeat(){
        var diffY;
        if (document.documentElement && document.documentElement.scrollTop)
        diffY = document.documentElement.scrollTop;
        else if (document.body)
        diffY = document.body.scrollTop
        else
        {/*Netscape stuff*/}
        //alert(diffY);
        percent=.1*(diffY-lastScrollY);
        if(percent>0)percent=Math.ceil(percent);
        else percent=Math.floor(percent);
        document.getElementById("leftDiv").style.top = parseInt(document.getElementById("leftDiv").style.top)+percent+"px";
        document.getElementById("rightDiv").style.top = parseInt(document.getElementById("rightDiv").style.top)+percent+"px";
        lastScrollY=lastScrollY+percent;
        //alert(lastScrollY);
    }
    //下面这段删除后，对联将不跟随屏幕而移动。
    window.setInterval("heartBeat()",1);
    //-->
        //关闭按钮
    function close_left1(){
        left1.style.visibility='hidden';
    }
    function close_left2(){
        left2.style.visibility='hidden';
    }
    function close_right1(){
        right1.style.visibility='hidden';
    }
    function close_right2(){
        right2.style.visibility='hidden';
    }
    //显示样式
    document.writeln("<style type=\"text\/css\">");
    document.writeln("#leftDiv,#rightDiv{113px;height:30px;position:absolute;}");
    document.writeln(".itemFloat{30px;height:auto;line-height:5px}");
    document.writeln("<\/style>");
    //以下为主要内容
    document.writeln("<div id=\"leftDiv\" style=\"top:40px;left:5px\">");
    //------左侧各块开始
    //---L1
    document.writeln("<div id=\"left1\" class=\"itemFloat\">");
    document.writeln("<\/div>");
    //---L2
    document.writeln("<div id=\"left2\" class=\"itemFloat\">");
    document.writeln("<\/div>");
    //------左侧各块结束
    document.writeln("<\/div>");
    document.writeln("<div id=\"rightDiv\" style=\"top:230px;right:5px\">");
    //------右侧各块结束
    //---R1
    document.writeln("<div id=\"right1\" class=\"itemFloat\">");
    document.writeln("<\/div>");
    //---R2
    document.writeln("<div id=\"right2\" class=\"itemFloat\">");
    document.writeln("<a href=# title=返回顶部><img border=0 src=images/rightnew.gif></a>");
    document.writeln("<\/div>");
    //------右侧各块结束
    document.writeln("<\/div>");
</script>

    <td width="113" height="1184" background="images/index_r2_c3.jpg" >
         
      <script type="text/javascript">
    heartBeat()
    </script>

          </td>

 方案二:

<script language="javascript" type="text/javascript">
function Layer()
{
    var layer1=document.getElementById("Layer1");
    layer1.style.top=(document.documentElement.scrollTop+(document.documentElement.clientHeight-document.getElementById("Layer1").offsetHeight)/4)+"px";
    layer1.style.left=(document.documentElement.scrollLeft)+5+"px";
    var layer2=document.getElementById("Layer2");
    layer2.style.top=(document.documentElement.scrollTop+(document.documentElement.clientHeight-document.getElementById("Layer2").offsetHeight)/4)+"px";
    layer2.style.left=(document.documentElement.scrollLeft+document.documentElement.clientWidth-document.getElementById("Layer2").offsetWidth)+"px";
}
window.onscroll=Layer;
window.onresize=Layer;
window.onload=Layer;
    </script>

<div id="Layer1" style="position: absolute; visibility: visible; z-index: 1;">
        </div>
        <div id="Layer2" style="position: absolute; visibility: visible; z-index: 1;">
            <a href='#' target='_blank'>
                <img src="images/rightnew.gif" border='0'></a>
        </div>

只有右边显示,此可以加左右2边