Html
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title></title>
<script type='text/javascript' src='jquery-1.2.3.min.js'></script>
<script type='text/javascript' src='menu.js'></script>
<link rel="stylesheet" href="style.css" type="text/css" media="screen" />
</head>
<body><ul id="nav">
<li><a href="#">1 HTML</a></li>
<li><a href="#">2 CSS</a></li>
<li><a href="#">3 Javascript </a>
<ul>
<li><a href="#">3.1 jQuery</a>
<ul>
<li><a href="#">3.1.1 Download</a></li>
<li><a href="#">3.1.2 Tutorial</a></li>
</ul>
</li>
<li><a href="#">3.2 Mootools</a></li>
<li><a href="#">3.3 Prototype</a></li>
</ul>
</li>
</ul>
</body>
</html>
jquery-1.2.3.min.js
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
menu.js
function mainmenu(){
$(" #nav ul ").css({display: "none"}); // Opera Fix
$(" #nav li").hover(function(){
$(this).find('ul:first').css({visibility: "visible",display: "none"}).show(400);
},function(){
$(this).find('ul:first').css({visibility: "hidden"});
});
}
$(document).ready(function(){
mainmenu();
});
style.css
body{
font-size:0.85em;
font-family:Verdana, Arial, Helvetica, sans-serif;
}
#nav, #nav ul{
margin:0;
padding:0;
list-style-type:none;
list-style-position:outside;
position:relative;
line-height:1.5em;
}
#nav a{
display:block;
padding:0px 5px;
border:1px solid #333;
color:#fff;
text-decoration:none;
background-color:#333;
}
#nav a:hover{
background-color:#fff;
color:#333;
}
#nav li{
float:left;
position:relative;
}
#nav ul {
position:absolute;
display:none;
width:12em;
top:1.5em;
}
#nav li ul a{
width:12em;
height:auto;
float:left;
}
#nav ul ul{
top:auto;
}
#nav li ul ul {
left:12em;
margin:0px 0 0 10px;
}
#nav li:hover ul ul, #nav li:hover ul ul ul, #nav li:hover ul ul ul ul{
display:none;
}
#nav li:hover ul, #nav li li:hover ul, #nav li li li:hover ul, #nav li li li li:hover ul{
display:block;
}
