JS实现的滑动展开与折叠效果

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：

<script type="text/javascript">
//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： <script type="text/javascript">
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>

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