符合css规范的下拉菜单(兼容ff\ie6\ie7)

<style> body{font-size:12px; font-family:"宋体";margin:0;padding:0;} #menu {height:29px!important;height:30px;line-height:29px;list-style-type: none;background:#B5DCF9;} #menu a {display: block; width: 80px; text-align:center;} #menu a:link {color:#000; text-decoration:none;} #menu a:visited {color:#000;text-decoration:none;} #menu a:hover {color:#FFF;text-decoration:none;font-weight:bold;} #menu li {float: left; width: 80px;   border-right:1px solid #fff;} #menu li a:hover{background:#6699ff;} #menu li ul {line-height: 25px; list-style-type: none;text-align:left; left: -1860em; width: 180px; position: absolute;top:15px!important;top:29px;} #menu li ul li{float: left; width: 130px;background: #6699ff;border-top:1px solid #fff} #menu li ul a{display: block; width:120px!important;width: 130px;text-align:left;padding-left:10px;} #menu li ul a:link {color:#fff; text-decoration:none;} #menu li ul a:visited {color:#fff;text-decoration:none;} #menu li ul a:hover {color:#000;text-decoration:none;font-weight:normal;background:#B5DCF9;} #menu li:hover ul {left: auto;} #menu li.sfhover ul {left: auto;} #content {clear: left;} </style> <script type=text/javascript><!--//--><![CDATA[//><!-- function menuFix() { var sfEls = document.getElementById("menu").getElementsByTagName("li"); for (var i=0; i<sfEls.length; i++) { sfEls[i].onmouseover=function() { this.className+=(this.className.length>0? " ": "") + "sfhover"; } sfEls[i].onMouseDown=function() { this.className+=(this.className.length>0? " ": "") + "sfhover"; } sfEls[i].onMouseUp=function() { this.className+=(this.className.length>0? " ": "") + "sfhover"; } sfEls[i].onmouseout=function() { this.className=this.className.replace(new RegExp("( ?|^)sfhover\\b"), ""); } } } window.onload=menuFix; //--><!]]></script> <div id="menu"> <li><a href="http://hi.baidu.com/dpxdqx">彦磊博客首页</a></li> <li><a href="http://hi.baidu.com/dpxeqx">网页技术</a>    <ul>     <li>      <a href="http://hi.baidu.com/dpxdqx">DIV+CSS</a>      <a href="http://hi.baidu.com/dpxdqx">JavaScrip</a>      <a href="http://hi.baidu.com/dpxdqx">网页基础</a>     </li>          </ul> </li> </div>