javascript脚本有关问题，帮忙看看多谢

javascript脚本问题，急，帮忙看看谢谢
<script type= "text/javascript ">

</script>
<div id= "menu1 " >
<ul>
<li class= "Showlist " style= "width:90% "> <a href= "# "> 会员基本信息 </a>  | 会员申请列表 | 会员过期列表 | 会员基本信息 </li>
</ul>
</div>

<div id= "menu2 " >
<ul>
<li class= "Showlist " style= "width:90% "> 代理合同基本信息 | 会员申请列表 |会员过期列表 |会员基本信息 </li>
</ul>
</div>

<div id= "menu3 ">
<ul>
<li class= "Showlist " style= "width:90%; "> 普通用户基本信息 | 会员申请列表 |会员过期列表 |会员基本信息 </li>
</ul>

</div>

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

</script>

兄弟姐妹们，这段代码为什么没有作用呢，三个菜单的内容全部显示，注：uClass值默认是1

[解决办法]
<div id= "menu1 " >
<ul>
<li class= "Showlist " style= "width:90% "> <a href= "# "> 会员基本信息 </a>  | 会员申请列表 | 会员过期列表 | 会员基本信息 </li>
</ul>
</div>

<div id= "menu2 " >
<ul>
<li class= "Showlist " style= "width:90% "> 代理合同基本信息 | 会员申请列表 |会员过期列表 |会员基本信息 </li>
</ul>
</div>

<div id= "menu3 ">
<ul>
<li class= "Showlist " style= "width:90%; "> 普通用户基本信息 | 会员申请列表 |会员过期列表 |会员基本信息 </li>
</ul>

</div>

</div>
</div>
<script type= "text/javascript ">
<!--
function MenuShow(uClass)
{
var div1,div2,div3;
div1=document.getElementById( "menu1 ");
div2=document.getElementById( "menu2 ");

div3=document.getElementById( "menu3 ");
if(uClass==1){
div1.style.display= "block ";
div2.style.display= "none ";
div3.style.display= "none ";}
else{
if(uClass==2){
div1.style.display= "none ";
div2.style.display= "block ";
div3.style.display= "none ";}
else{
//div1.style.display= "none ";
//div2.style.display= "none ";
//div3.style.display= "block ";
div1.style.visibility= "hidden ";
div1.style.visibility= "visible ";
div1.style.visibility= "visible ";
}
}

}
//-->
</script>

<script type= "text/javascript ">

</script>

javascript脚本有关问题帮忙看看多谢

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