body {margin:20px; font:13px Arial, Helvetica, sans-serif}
* {padding:0; margin:0}
.dropdown {float:left; padding-right:0px}
.dropdown dt {width:122px; border:2px solid #000000; padding:8px; font-weight:bold; cursor:pointer; background:url(images/navi.jpg)}
.dropdown dt:hover {background:url(images/over.jpg)}
.dropdown dd {position:absolute; overflow:hidden; width:141px; display:none; background:#fff; z-index:142; opacity:0}
.dropdown ul {width:142px; border:1px solid #000000; list-style:none; border-top:none}
.dropdown li {display:inline}
.dropdown a, .dropdown a:active, .dropdown a:visited {display:block; padding:5px; color:#333; text-decoration:none; background:#ededed; width:142px}
.dropdown a:hover {background:#cdcdcd; color:#000}
.dropdown .underline {border-bottom:1px solid #000000}