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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：
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