响应鼠标滚动的jQuery动感菜单

答案：<!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>响应鼠标滚动的jQuery动感菜单</title>
<style>
ul#topnav {
     margin: 15px 0 50px 0;
     padding: 0;
     list-style: none;
     float: left;
     font-size: 1.1em;
}
ul#topnav li {
     margin: 0;
     padding: 0;
     overflow: hidden;
     float: left;
     height: 40px;
}
ul#topnav li.home {
     width: 75px;
}
ul#topnav li.Rss {
     width: 75px;
}
ul#topnav li.Portfolio {
     width: 105px;
}
ul#topnav li.Blog {
     width: 75px;
}
ul#topnav li.About {
     width: 80px;
}
ul#topnav li.Contact {
     width: 95px;
}
ul#topnav a, ul#topnav span {
     padding: 10px 20px;
     float: left;
     text-decoration: none;
     color: #fff;
     background: url(/jscss/demoimg/201008/a_bg.gif) repeat-x;
     text-transform: uppercase;
     clear: both;
     width: 100%;
     height: 20px;
     line-height: 20px;
}
ul#topnav a{
     color: #555;
     background-position: left bottom;
}
ul#topnav span { 
     background-position: left top;
}
ul#topnav.v2 span {
     background: transparent url(/jscss/demoimg/201008/a_bg.gif) repeat-x left top;
}
ul#topnav.v2 a {
     background: transparent url(/jscss/demoimg/201008/a_bg.gif) repeat-x left bottom;
     color: #555;
}
</style>
<script type="text/javascript" src="/ajaxjs/jquery1.3.2.js"></script>
</head>
<script>
$(document).ready(function() {
$("#topnav li").prepend("<span></span>");
$("#topnav li").each(function() {
var linkText = $(this).find("a").html();
$(this).find("span").show().html(linkText);}); 
$("#topnav li").hover(function() {
$(this).find("span").stop().animate({
marginTop: "-40"
}, 250);
} , function() {
$(this).find("span").stop().animate({
marginTop: "0"
}, 250);
});
});
</script>
<body>

<ul id="topnav">
    <li><a href="#">Home</a></li>
    <li><a href="#">Portfolio</a></li>
    <li><a href="#">Blog</a></li>
    <li><a href="#">About</a></li>
    <li><a href="#">Contact</a></li>
    <li><a href="#">Rss</a></li>
</ul>
</body>
</html>
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