El codigo que utilizo es el siguiente:
Código PHP:
<html>
<head>
<title>Menu</title>
</head>
<style type="text/css">
.preload1 {background: url(img/pro_drop4_2a.gif);}
.preload1 {background: url(img/pro_drop4_2b.gif);}
.prodrop4 {padding:0 0 0 32px; margin:0; list-style:none; height:36px; background:transparent url(img/pro_drop4_back.gif); position:relative; z-index:500; font-family:arial, verdana, sans-serif;}
.prodrop4 li.top {display:block; float:left;}
.prodrop4 li a.top_link {display:block; float:left; height:36px; line-height:27px; color:#666; text-decoration:none; font-size:11px; font-weight:bold; padding:0 0 0 10px; cursor:pointer;background: url(img/pro_drop4_0a.gif) no-repeat;}
.prodrop4 li a.top_link span {float:left; display:block; padding:0 20px 0 10px; height:36px;background:url(img/pro_drop4_0b.gif) right top;}
.prodrop4 li a.top_link:hover {color:#000; background: url(img/pro_drop4_2a.gif) no-repeat; line-height:25px;}
.prodrop4 li a.top_link:hover span {background:url(img/pro_drop4_2b.gif) no-repeat right top;}
.prodrop4 li:hover > a.top_link {color:#000; background: url(img/pro_drop4_2a.gif) no-repeat; line-height:25px;}
.prodrop4 li:hover > a.top_link span {background:url(img/pro_drop4_2b.gif) no-repeat right top;}
.prodrop4 table {border-collapse:collapse; width:0; height:0; position:absolute; top:0; left:0;}
.prodrop4 a:hover {visibility:visible; position:relative; z-index:200;}
.prodrop4 li:hover {position:relative; z-index:200;}
.prodrop4 ul {position:absolute; left:-9999px; top:-9999px; width:0; height:0; margin:0; padding:0; list-style:none;}
.prodrop4 ul.sub1 {width:115px;}
.prodrop4 ul.sub2 {width:1px;}
.prodrop4 ul.sub3 {width:90px;}
.prodrop4 ul.sub4 {width:112px;}
.prodrop4 :hover ul {left:0; top:35px; background: #fff; padding:3px; border:1px solid #00A397; border-width:0 1px 1px; white-space:nowrap; height:auto; z-index:300;}
.prodrop4 :hover ul li {display:block; height:20px; position:relative; font-weight:normal; width:auto;}
.prodrop4 :hover ul li a {display:block; font-size:11px; height:20px; line-height:20px; width:auto; padding:0 10px; color:#00A397; text-decoration:none;}
.prodrop4 :hover ul li a:hover {background:#00A397; color:#fff;}
</style>
<body>
<span class="preload1"></span>
<span class="preload2"></span>
<ul class="prodrop4">
<li class="top"><a href="#" id="config" class="top_link">Menu 1<!--[if gte IE 7]><!--></a><!--<![endif]-->
<!--[if lte IE 6]><table><tr><td><![endif]-->
<ul class="sub2">
<li><a href="?menu=estadistica">Submenu11</a></li>
<li><a href="?menu=estadistica">Submenu1</a></li>
</ul>
<!--[if lte IE 6]></td></tr></table></a><![endif]-->
</li>
<li class="top"><a href="#" id="config" class="top_link">Menu 2<!--[if gte IE 7]><!--></a><!--<![endif]-->
<!--[if lte IE 6]><table><tr><td><![endif]-->
<ul class="sub3">
<li><a href="?menu=estadistica">Submenu21</a></li>
<li><a href="?menu=estadistica">Submenu22</a></li>
</ul>
<!--[if lte IE 6]></td></tr></table></a><![endif]-->
</li>
</ul>
</body>
</html>
Estare muy agradecido si alguien podria indicarme el error o el horror que estoy cometiendo.