具有高亮显示效果的多级菜单

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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>具有高亮效果的菜单</title>
<style type="text/css">
body{ font:12px/22px "微软雅黑","宋体"; background:url(); color:#5d5d5d;}
*{ padding:0; margin:0;}
a{outline:none; text-decoration:none; color:#5d5d5d;}
a:active{noOutline:expression(this.onFocus=this.blur());}
:focus{outline:0;}
a img{ border:none;}
ul li{ list-style:none;}
.t_nav{ height:35px; line-height:35px; background:#008c9c url() no-repeat 720px 5px; margin-bottom:20px;}
.dropdown{ width:690px; padding-left:10px; float:left; position:relative; z-index:100;}
.dropdown li{ height:35px; font-size:14px; float:left; zoom:1;}
.dropdown li a{ color:#FFF;}
.t_nav .sou_suo{ width:300px; float:left; height:30px; padding-top:5px; overflow:hidden; line-height:22px;}
.t_nav .sou_suo span{ display:inline-block;}
.d_s_1{ width:195px; margin-left:25px;}
.d_s_1 input{ width:165px; background:none; border:none;}
.d_s_2 input{ width:48px; border:none; cursor:pointer; background:none;}
ul.dropdown li:last-child a { border-right: none; } 
ul.dropdown li.hover,ul.dropdown li:hover {position: relative;}
ul.dropdown li.hover a{ color:#008C9C;}
ul.dropdown ul{visibility: hidden;position: absolute;top: 35px;left: 1px;z-index:20;}
ul.dropdown ul li{background:#008C9C; border-top: 2px solid #ccc; float: none; height:auto;line-height:25px; color:#FFF;}
ul.dropdown li:hover > ul{ visibility: visible; }
#Nav .sub_menu li{ background:none; _width:76px; _overflow:hidden;}
body #Nav .hover a{ background:#008c9c; color:#fff;}
body #Nav a{ display:inline-block; width:auto; height:35px; padding:0 10px; margin:0 1px;}
body #Nav a:hover,body #Nav .cur a{ background-color:#fff; color:#008c9c}
body #Nav .sub_menu li.cur a{ background:#008c9c; color:#fff;}
body #Nav .sub_menu a{ margin:0; background:#008c9c; color:#fff; line-height:30px; height:30px;}
body #Nav .sub_menu .hover a{ background:#008c9c; color:#fff;}
body #Nav .sub_menu .hover a:hover{ background:#fff; color:#008c9c;}
body #Nav .cur{ position:relative;}
body #Nav .cur .sub_menu{ position:absolute;}
</style>
</head>
<body>
<div class="t_nav">
    	<ul class="dropdown"  id="Nav">
        	<li><a href="#">首页</a></li>
        	<li><a href="#">关于我们</a></li>
        	<li><a href="#">新闻资讯</a>
            	<ul class="sub_menu">
                	<li><a href="#">公司新闻</a></li>
                	<li><a href="#">图片新闻</a></li>
                	<li><a href="#">媒体聚焦</a></li>
                	<li><a href="#">行业资讯</a></li>
                </ul>
            </li>
        	<li><a href="#">公司业务</a></li>
        	<li><a href="#">合作伙伴</a></li>
        	<li><a href="#">经典案例</a></li>
        	<li><a href="#">诚聘英才</a></li>
        	<li><a href="#">联系我们</a></li>
        </ul>
<script language="javascript">
function setCookie(name,value,time_sec){
    var Days = 30;
    var exp  = new Date();
    exp.setTime(exp.getTime() + time_sec*1000);
    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString() + ";";
}
function getCookie(name){
    var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
    if(arr != null) return unescape(arr[2]); return null;
}
var o=document.getElementById("Nav").getElementsByTagName("li");
var m=getCookie("NavIndex");
if(!isNaN(m) && m!=null){
	o[m].className="cur";
}else{
	o[0].className="cur";
}
for(var n=0;n<o.length;n++){
	o[n].onclick=function(){
		for(var i=0;i<o.length;i++){
			o[i].className="";
			o[i].index=i;
 		}
		this.className="cur";
		setCookie("NavIndex",this.index,3600*24*365);
	}
}
</script>

        <div class="sou_suo">
        	<span class="d_s_1"><input name="" type="text" /></span>
            <span class="d_s_2"><input name="" type="button" /></span>
        </div>
    </div>
</body>
</html>
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