纯CSS实现的圆角折叠菜单特效代码

<title>CSS圆角折叠菜单</title>
<style type="text/css">
#menu {
   font-size:12px;
   height:380px;
   margin:0; 
   padding:0; 
   width:180px;
   overflow:hidden; 
   background:#f0f0f0;
   list-style:none;
   border-left:1px solid #DDD; 
   border-right:1px solid #DDD;
}
#menu li a {
   display:block; 
   text-decoration:none; 
   color:#00b; 
   margin:0; 
   width:100%;
   }
#menu li a span {
   display:none; 
   color:#000;
   height:120px
   }
#menu li a.one span {
   display:block; 
   margin:0 10px;
}
#menu li a:hover {
   background:#f1f1f1;
   }
#menu li a:hover span {
   display:block; 
   margin:0 10px; 
   cursor:pointer;
}
#menu .h2 {
   margin:0 5px; 
   padding:0; 
   color:#808; 
   font-variant:small-caps; 
   border:0;
   }
#menu .h3 {
   margin:0 5px; 
   padding:0; 
   color:#00b;
   }
.curved {
   width:180px; 
   margin:0 auto;
   }
.curved .b1, .curved .b2, .curved .b3, .curved .b4   {
   font-size:1px; 
   display:block; 
   background:#88c;
   overflow: hidden;
   }
.curved .b1, .curved .b2, .curved .b3 {
   height:1px;
}
.curved .b2, .curved .b3, .curved .b4 {
   background:#f0f0f0; 
   border-left:1px solid #DDD; 
   border-right:1px solid #DDD;
   }
.curved .b1 {
   margin:0 4px; 
   background:#DDD;
   }
.curved .b2 {
   margin:0 2px; 
   border-width:0 2px;
   }
.curved .b3 {
   margin:0 1px;
   }
.curved .b4 { 
   height:2px;
   margin:0px;
   }
</style> 
<div class="curved">
<b class="b1 c1">
</b>
<b class="b2 c2">
</b>
<b class="b3 c3">
</b>
<b class="b4 c4" ></b>
   <ul id="menu">
     <li>
      <a   href="/">
       <b class="h2">ASP CODE</b>
      <span>阿里西西</span>
      </a>
     </li>
     <li>
      <a href="#nogo">
       <b class="b1"></b>
       <b class="b2"></b>
       <b class="h2">PHP CODE</b>
       <span>网页特效</span>
      </a>
     </li>
     <li>
      <a href="#nogo">
       <b class="b1"></b>
       <b class="b2"></b>
<b class="h2">JSP CODE</b>
<span>js.alixixi.com</span> 
     </a>
     </li>
 </ul><b class="b4"></b><b class="b3"></b><b class="b2"></b><b class="b1"></b></div>