为什么我第二个一级菜单弹不出来了，只有第一个可以

<!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=utf-8" />
<title>动画菜单</title>
<style type="text/css">
* { margin: 0; padding: 0; font-size: 14px; }
a { color: #333; text-decoration: none }
ul{ list-style: none; }
.nav {height: 30px; border-bottom: 5px solid #F60; margin-left:50px; width:600px;}
.nav li { float: left; position:relative; height:30px; width:120px }
.nav li a { display: block; height: 30px; text-align: center; line-height: 30px; width:120px; background: #efefef; margin-left: 1px; }
.subNav{ position:absolute; top:30px; left:0; width:120px; height:0; overflow:hidden}
.subNav li a{ background:#ddd }
.subNav li a:hover{ background:#efefef}
</style>
<script>
window.onload=function(){
    var aLi=document.getElementsByTagName('li');
for(var i=0; i<aLi.length; i++){
        aLi[i].getElementsByTagName("ul")[0].timer=null;
  aLi[i].onmouseover=function(){
            //鼠标经过一级菜单，二级菜单动画下拉显示出来

          startMove(this.getElementsByTagName("ul")[0],120)

  }
        //鼠标离开菜单，二级菜单动画收缩起来。
  aLi[i].onmouseout=function(){
  startMove(this.getElementsByTagName("ul")[0],0)

  }


}
}
//
function startMove(obj,dita)
{ var speed=0;
clearInterval(obj.timer)
obj.timer=setInterval(function(){
     speed=(dita-obj.offsetHeight)/20;
     speed=speed>0?Math.ceil(speed):Math.floor(speed);
      if(obj.offsetHeight==dita)
      {clearInterval(obj.timer)}
      else
      {obj.style.height=obj.offsetHeight+speed+'px'}

},30)
}
</script>
</head>
<body>
<ul class="nav">
    <li><a href="#">一级菜单</a>
    <ul class="subNav">
        <li><a href="#">二级菜单</a></li>
            <li><a href="#">二级菜单</a></li>
            <li><a href="#">二级菜单</a></li>
            <li><a href="#">二级菜单</a></li>
        </ul>
    </li>
    <li><a href="#">一级菜单</a>
    <ul class="subNav">
        <li><a href="#">二级菜单</a></li>
            <li><a href="#">二级菜单</a></li>
            <li><a href="#">二级菜单</a></li>
            <li><a href="#">二级菜单</a></li>
        </ul>
    </li>
    <li><a href="#">一级菜单</a></li>
    <li><a href="#">一级菜单</a></li>
    <li><a href="#">一级菜单</a></li>
</ul>
</body>
</html>