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水平布局的多级网页菜单，JS、css代码
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>蓝色带阴影超酷的css+js导航菜单代码</title>
<style>
body {margin:0px;}
a:link {text-decoration: none;}
a:visited {text-decoration: none;}
a:hover {text-decoration: none;}
a:active {text-decoration: none;}
#nav_wrap {width:960px;}
#nav{background:url(/jscss/demoimg/201401/nav_bg1.gif) repeat-x bottom; height:49px; position:relative; width:950px; margin:20px auto;}
#nav .l{background:url(/jscss/demoimg/201401/nav_l1.gif) no-repeat bottom; height:49px; width:28px; float:left}
#nav li {float:left; list-style:none;text-align:center;font-size:14px; }
#nav li .v a{width:108px;height:49px; line-height:49px; display:block; color:#FFF;float:left; font-family:Arial,Verdana,Tahoma,"宋体"; }
#nav li .v a:hover,#nav li .v .sele{background:url(/jscss/demoimg/201401/nav_hover1.gif) no-repeat bottom;color:#fff;height:49px;line-height:49px; font-size:14px;}
#nav .kind_menu {height:30px;*height:29px;line-height:30px;vertical-align:middle; position:absolute;top:46px;*top:48px;left:70px;width:880px; text-align:left; display:none;color:#000;font-size:12px;}
#nav .kind_menu a {color:#000; float:left; text-align:center; width:90px; font-family:Arial,Verdana,Tahoma,"宋体";font-size:12px;}
#nav .kind_menu a:hover {color:#000;border-bottom:2px #222b8e solid;}
#nav .kind_menu span {font-size:10px; color:#000; line-height:30px; *line-height:26px; float:left }
</style>
<SCRIPT src="http://www.codefans.net/ajaxjs/jquery1.3.2.js" type=text/javascript></SCRIPT>
</head>
<body style="text-align:center">
<DIV id=nav_wrap>
<DIV id=nav>
<DIV class="l"></DIV>
<UL class="c">
<LI><SPAN class="v"><A href="http://www.codefans.net" target="_blank">首页</A></SPAN>
<DIV class="kind_menu" style="LEFT:50px">欢迎您访问源码爱好者,我们为您提供最优质的网络营销服务! </DIV></LI>
<LI><SPAN class="v"><A href="http://www.mamicode.com/#">特惠套餐</A></SPAN>
<DIV class="kind_menu" style="LEFT: 40px">
<A href="http://www.mamicode.com/#">电信特惠套餐</A> <SPAN>|</SPAN>
<A href="http://www.mamicode.com/#">智能双线套餐</A> </DIV></LI>
<LI><SPAN class="v"><A href="http://www.mamicode.com/#">域名频道</A></SPAN>
<DIV class="kind_menu">
<A href="http://www.mamicode.com/#">英文域名</A><SPAN>|</SPAN>
<A href="http://www.mamicode.com/#">中文域名</A><SPAN>|</SPAN>
<A href="http://www.mamicode.com/#">通用网址</A><SPAN>|</SPAN>
<A href="http://www.mamicode.com/#">域名交易</A><SPAN>|</SPAN>
<A href="http://www.mamicode.com/#">域名帮助</A><SPAN>|</SPAN>
<A href="http://www.mamicode.com/#">智能加速</A> </DIV></LI>
<LI><SPAN class="v"><A href="http://www.mamicode.com/#">源码下载</A></SPAN>
<DIV class="kind_menu" style="LEFT: 40px">
<A href="http://www.mamicode.com/#">网络营销外包</A> <SPAN>|</SPAN>
<A href="http://www.mamicode.com/#">网页特效代码</A> </DIV></LI>
<LI><SPAN class="v"><A href="http://www.codefans.net/jscss/">网页特效</A></SPAN>
<DIV class="kind_menu" style="LEFT: 40px">
<A href="http://www.mamicode.com/#">网络外包</A> <SPAN>|</SPAN>
<A href="http://www.mamicode.com/#">网络营销</A> <SPAN>|</SPAN>
<A href="http://www.mamicode.com/#">特效代码</A> </DIV></LI>
<LI><SPAN class="v"><A href="http://www.baidu.com">百度一下</A></SPAN>
<DIV class="kind_menu" style="LEFT: 40px">
<A href="http://www.mamicode.com/#">网络外包</A> <SPAN>|</SPAN>
<A href="http://www.mamicode.com/#">营销外包</A> <SPAN>|</SPAN>
<A href="http://www.mamicode.com/#">网页特效</A> </DIV></LI>
</UL>
</DIV><!--nav-->
</DIV><!--nav_wrap-->
<SCRIPT type=text/javascript>
var site_url = window.location.href.toLowerCase();
switch (true) {
default :
$("#nav li").attr("class","");
$("#nav li").eq(0).attr("class","nav_lishw");
$(".nav_lishw .v a").attr("class","sele");
$(".nav_lishw .kind_menu").show();
}
$("#nav li").hover(
function(){
clearTimeout(setTimeout("0")-1);
$("#nav .kind_menu").hide();
$("#nav li .v .sele").attr("class","shutAhover");
$(this).attr("id","nav_hover")
$("#nav_hover .v a").attr("class","sele");
$("#nav_hover .kind_menu").show();
},
function(){
if($(this).attr("class") != "nav_lishw"){
$("#nav_hover .v .sele").attr("class","");
$("#nav_hover .kind_menu").hide();
}
$(this).attr("id","")
$("#nav li .v .shutAhover").attr("class","sele");
setTimeout(function(){
$(".nav_lishw .kind_menu").show();
$(".nav_lishw .v a").attr("class","sele");
},50);
}
);
</SCRIPT>
</body>
</html>