JavaScript CSS 菜单功能代码

<html> 
<head> 
<META NAME="Author" CONTENT="Ma Jia Nan"> 
<META NAME="Date" CONTENT="2008-12-7"> 
<META NAME="Description" CONTENT=""> 
<title>Menu</title> 
<style type='text/css'> 
#menubar { 
font-family:verdana; 
font-size:12px; 
margin:1px; 
} 
#menubar li { 
float:left; 
position:relative; 
text-align:left; 
} 
/* each menu item style */ 
#menubar li a { 
border-style:none; 
color:black; 
display:block; 
width:150px; 
height:20px; 
line-height:20px; 
padding-left:10px; 
text-decoration:none; 
} 
/* the first level menu which displays default */ 
#menubar .menuMain{ 
border-color:#C0C0C0; 
border-width:1px; 
border-style:solid; 
} 
/* the first leve style when mouse on it */ 
#menubar li a:hover{ 
background-color:#efefef; 
text-decoration:underline; 
} 
/* the second level menu block style */ 
#menubar li ul{ 
background-color:#efefef; 
border-style:none; 
display:none; 
position:absolute; 
top:20px; 
left:-40px; 
margin-top:2px; 
width:150px; 
} 
/* the sub menu item style when mouse on it */ 
#menubar li ul li a:hover { 
text-decoration:underline; 
padding-left:20px; 
} 
/* the third or more level menu block style */ 
#menubar li ul li ul { 
display:none; 
position:absolute; 
top:0px; 
left:150px; 
margin-top:0; 
margin-left:0; 
width:150px; 
} 
</style>

function hideSubMenu(li){ 
var subMenu = li.getElementsByTagName('ul')[0]; 
subMenu.style.display = 'none'; 
} 
</script> 
</head> 
<body> 
 
<ul id='menubar'> 
<li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> 
File 
<ul> 
<li>New</li> 
<li>Open</li> 
<li>Save</li> 
<li>Save As</li> 
<li>Close</li> 
</ul> 
</li> 
<li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> 
Edit 
<ul> 
<li>Cut</li> 
<li>Copy</li> 
<li>Paset</li> 
<li>Delete</li> 
<li>Select All</li> 
</ul> 
</li> 
<li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> 
View 
<ul> 
<li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> 
View List 
<ul> 
<li>Tool Bar</li> 
<li>State Bar</li> 
<li>Function List</li> 
<li>Label List</li> 
</ul> 
</li> 
<li>Show Line Number</li> 
<li>Set Color</li> 
</ul> 
</li> 
</ul> 
 
</body> 
</html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]