一个点击可显示再点击隐藏层的代码，并可随浏览器滚动条拉伸而滚动，可广泛适用于广告、在线客服、快捷留言发布等功能的精短代码。

<div style="width:100px;height:100px;position:absolute;left:-200px;top:80px;background:#FFCC00;border:1px solid #999;">点击可隐藏</div>
<div style="position:absolute;left:2px;top:80px;"><img src=http://www.sh-windows.cn alt="点击打开" /></div>
<script type="text/Ｊavascript">
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var i=0, str="";while(i++<100){str+="<br>"}
document.write(str);

var c=0;
var div = document.getElementsByTagName("div")[0];
var img = document.getElementsByTagName("div")[1];

div.Ｏnclick = function(){
img.style.left = "2px";
div.style.left = "-200px";
}

img.Ｏnclick = function(){
div.style.left = "2px";
img.style.left = "-200px";
}

var y = parseInt(div.style.top);
var my = parseInt(img.style.top);

window.onscroll = function(){
clearInterval(c);
c = setInterval(function(){
var cy = parseInt(div.style.top);
var mcy = parseInt(img.style.top);
var dy = document.body.scrollTop || document.documentElement.scrollTop;
div.style.top = (cy + (dy -(cy-y))*0.1) + "px";
img.style.top = (mcy + (dy -(mcy-my))*0.1) + "px";
},10);
}
//-->
</script>

IE6.0和Fire火狐浏览器中测试通过，其他未测试。Ｊ和Ｏ改成小写的字母j和o