<style type="text/css">
<!--
#menu {width:500px;padding:0;margin:40px auto;list-style-type:none;display:<span href="tag.php?name=tab" onclick="tagshow(event)" class="t_tag">table</span>;}
#menu li {width:100px; float:left; line-height:30px}
#menu a {position:relative;display:block; text-decoration:none; background:#cccccc;width:100px; }
#menu a span {display:block; font-weight:bold;color:#000; border-style:solid;border-width:0px 2px 2px 0px; border-color:#fff #fff #06a #fff;text-align:center; }
#menu a em {display:none;}
#menu a:hover {background:#FF0000;}
#menu a:hover span {color:#fff; }
#menu a:hover em {display:block; overflow:hidden; border:6px solid #06a; border-color:#06a #fff; border-width:6px 6px 0 6px; position:absolute; left:50%; top:100%;margin-left:-6px;}
--></style>
<ul id="menu"> <li><a href="#nogo"><span>M One</span><em></em></a></li> <li><a href="#nogo"><span>M Two</span><em></em></a></li> <li><a href="#nogo"><span>M Three</span><em></em></a></li> <li><a href="#nogo"><span>M Four</span><em></em></a></li></ul>