收缩/展开的HTML代码,如何让收缩速度更快一点

<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>收缩/展开</title>
</head>
<body>
<!--收缩/展开全文-->
<script type="text/javascript">
var mh = 30;//最小高度
var step = 5;//每次变化的px量
var ms = 0;//每隔多久循环一次
function toggle123(o){
if (!o.tid)o.tid = "_" + Math.random() * 100;
if (!window.toggler)window.toggler = {};
if (!window.toggler[o.tid]){
window.toggler[o.tid]={
obj:o,
maxHeight:o.offsetHeight,
minHeight:mh,
timer:null,
action:1
};
}
o.style.height = o.offsetHeight + "px";
if (window.toggler[o.tid].timer)clearTimeout(window.toggler[o.tid].timer);
window.toggler[o.tid].action *= -1;
window.toggler[o.tid].timer = setTimeout("anim('"+o.tid+"')",ms );
}
function anim(id){
var t = window.toggler[id];
var o = window.toggler[id].obj;
if (t.action < 0){
if (o.offsetHeight <= t.minHeight){
clearTimeout(t.timer);
return;
}
}
else{
if (o.offsetHeight >= t.maxHeight){
clearTimeout(t.timer);
return;
}
}
o.style.height = (parseInt(o.style.height, 10) + t.action * step) + "px";
window.toggler[id].timer = setTimeout("anim('"+id+"')",ms );
}
window.onload=function(){
toggle123(document.getElementById("shoukaiaaa"))
}
</script>
<style type="text/css">
div.shoukaisss{border:solid 1px;overflow:hidden;}
div.shoukaisss h5{border:solid 1px;border-width:0 0 1px;padding:0;margin:0;height:30px;line-height:30px;cursor:pointer;background:#E7F5F8;color:red;}
</style>
<div class="shoukaisss" id="shoukaiaaa"><h5 onclick="toggle123(this.parentNode)">
鼠标点击 查看完整文章!</h5>
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<p>正文正言语正文正班主主桛一在</p>
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<p>正文正言语正文正班主主桛一在</p>
<p>正文正言语正文正班主主桛一在</p>
<p>正文正言语正文正班主主桛一在</p>
<p>正文正言语正文正班主主桛一在</p>
<p>正文正言语正文正班主主桛一在</p>
<p>正文正言语正文正班主主桛一在</p>
<p>正文正言语正文正班主主桛一在</p>
<p>正文正言语正文正班主主桛一在</p>
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<p>正文正言语正文正班主主桛一在</p>
<p>正文正言语正文正班主主桛一在</p>
</td></tr></table>
</div>
<!--// 收缩/展开全文-->

</body>
</html>

我放收缩和展开的地方,是文章,现在这样默认是收缩的

有没有办法,让这个收缩和展开的速度加快一点呢??

var step = 5;
改成

var step = 50;
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