窗口弹出有关问题，进来瞅瞅

窗口弹出问题，进来瞅瞅
[code=HTML][/code]

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Menu.html</title>

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link rel="stylesheet" href="Menu.css" type="text/css"></link>
<script language="javascript" type="text/javascript">
function Show(val){
if(val=="menu"){
document.getElementById("menu").style.display="block";
}
}

function Close(val){
if(val=="menu"){
document.getElementById("menu").style.display="none";
}
}
</script>

</head>

<body>
<div class="all">
<ul>
<li onmouseover="Show('menu')" onmousemove="Close('menu')"><a href="#" ></a>菜单</li>
<li><table class="menu" id="menu">
<tr><td><ul><li><a href="#"></a>注册</li>
<li><a href="#"></a>登入</li>
<li><a href="#"></a>监测</li></ul></td></tr>
</table>
</li>
</ul>
</div>
</body>
</html>

[code=CSS][/code]

.all{
width:100px;
background-color: gray;
border: 2px solid blue;
text-align: center;
}

.all ul{
list-style-type: none;
padding: 0;
margin: 0;
}

.menu {
display: none;
}

弹出的窗口为何只是闪出来一下就没了

------解决方案--------------------
<li onmouseover="Show('menu')" onmousemove="Close('menu')">
这个是什么情况？是不是第二个要写成onmouseout
------解决方案--------------------

HTML code

<!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>
<title>导航菜单</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<style type="text/css">
.menu{width:100%;}
.menu ul{float:left;list-style:none;width:100%;}
.menu li{float:left;list-style:none;text-align:left;margin-left:10px;width:106px;height:20px;position:relative;}
.menu li span{float:left;width:60px;display:none;background:#fff; position:absolute;border:1px solid #bfbfbf;left:-15px;top:20px;/*因为position的定义,实际上该区域原点仍为父级标签的原点,因此设置一个top偏离*/}
.menu li span a{float:left;width:100%;color: #4454AB;text-align:center;height:28px;line-height:28px;text-decoration:none;}
.menu li span a:hover{color: #ff9900;}
</style>
<script type="text/javascript">

function MenuEventListen(){
  var _menu=document.getElementById("menu");
  var _li=_menu.getElementsByTagName("li");
  for(i=0;i<_li.length;i++)
  {
      _li[i].onmouseover=function(){
        this.getElementsByTagName('span')[0].style.display='block';
      };
      _li[i].onmouseout=function(){
        this.getElementsByTagName('span')[0].style.display='none';
        };
  }
}
window.onload=function(){
    MenuEventListen();
}
</script>
</head>
<body>
<div id="menu" class="menu">
  <ul>
  <li>
  <a href="#">菜单</a>
  <span><a href="#">注册</a><a href="#">登入</a><a href="#">监测</a></span>
  </li>

  </ul>
</div>

  <div>这里是其他内容，这里是其他内容</div>
</body>
</html>

窗口弹出有关问题，进来瞅瞅

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