功能说明:
滑动展开/收缩广告效果,可指定：广告完全展开时的停留时间，最大高度
兼容浏览器：
IE5.0+、FF1.06+、Opera8.0+
实例代码：
<!doctype html public "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="gb2312">
<head>
<title> 代码实例：滑动展开/收缩广告 </title>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<meta name="author" content="枫岩,CNLei.y.l@gmail.com">
<meta name="keywords" content="代码实例：滑动展开/收缩广告" />
<script type="text/javascript">
var intervalId = null;
function slideAd(id,nStayTime,sState,nMaxHth,nMinHth){
this.stayTime=nStayTime*1000 || 3000;
this.maxHeigth=nMaxHth || 90;
this.minHeigth=nMinHth || 1;
this.state=sState || "down" ;
var obj = document.getElementById(id);
if(intervalId != null)window.clearInterval(intervalId);
function openBox(){
var h = obj.offsetHeight;
obj.style.height = ((this.state == "down") ? (h + 2) : (h - 2))+"px";
if(obj.offsetHeight>this.maxHeigth){
window.clearInterval(intervalId);
intervalId=window.setInterval(closeBox,this.stayTime);
}
if (obj.offsetHeight<this.minHeigth){
window.clearInterval(intervalId);
obj.style.display="none";
}
}
function closeBox(){
slideAd(id,this.stayTime,"up",nMaxHth,nMinHth);
}
intervalId = window.setInterval(openBox,10);
}
</script>
</head>
<body style="margin:0;padding:0;font-size:14px;">
<div id="MyMoveAd" style="background:#ff0;height:12px;overflow:hidden;">
<ul>
<li>这里是广告内内容</li>
<li>这里是广告内内容</li>
<li>这里是广告内内容</li>
<li>这里是广告内内容</li>
<li>这里是广告内内容</li>
<li>这里是广告内内容</li>
<li>这里是广告内内容</li>
<li>这里是广告内内容</li>
<li>这里是广告内内容</li>
<li>这里是广告内内容</li>
<li>这里是广告内内容</li>
<li>这里是广告内内容</li>
<li>这里是广告内内容</li>
<li>这里是广告内内容</li>
<li>这里是广告内内容</li>
</ul>
</div>
<p>代码实例：<strong>滑动展开/收缩广告</strong> 请刷新页面，再次观看演示效果</p>
<script type="text/javascript">
<!--
slideAd('MyMoveAd',2);
-->
</script>
</body>
</html>
需要写个滑动展开折叠的效果，搜索到无忧脚本的一篇贴子，稍加修改了下使其在FF也可应用，代码如下：
//Url: http://bbs.51js.com/thread-61646-1-1.html
//Author: 风云突变
//Modify: 枫岩
var act;
function over(s,nMax){
var obj=document.getElementById(s);
var h = parseInt(obj.offsetHeight);
if (h < nMax){
obj.style.height = (h + 2)+"px";
clearTimeout(act);
act = setTimeout("over('"+s+"',"+nMax+")", 10);
}
}
function out(s,nMin){
var obj=document.getElementById(s);
var h = parseInt(obj.offsetHeight);
if (h > nMin){
obj.style.height = (h - 2)+"px";
clearTimeout(act);
act = setTimeout("out('"+s+"',"+nMin+")", 10);
}
}
</script>
<div id="mytd" onmouseover="over('mytd',200);" onmouseout="out('mytd',30);" style="background:#eee;">代码实例：层的滑动展开/折叠</div>
无忧网友 fangxiao9159 再次优化后：
var intervalId = null;
function move(id,state){
var obj = document.getElementById(id);
if(intervalId != null)
window.clearInterval(intervalId);
function change(){
var h = parseInt(obj.offsetHeight);
obj.style.height = (state == "down") ? (h + 2) : (h - 2);
}
intervalId = window.setInterval(change,10);
}
</script>
<table border="1" cellpadding="0" cellspacing="0" id="mytd" onmouseover="move('mytd','down');" onmouseout="move('mytd','out');">
<tr><td>无忧脚本 - 风云突变</td></tr></table>
来源：http://www.cnlei.org/blog/article.asp?id=324
http://www.wujianrong.com/mt-tb.cgi/4157