.dropdown {float:left;}
.dropdown dt {cursor:pointer;}
.dropdown dt:hover {}
.dropdown dd {position:absolute; overflow:hidden; display:none; z-index:200; opacity:0}
.dropdown ul {list-style:none; border-top:none}
.dropdown li {display:inline;}
.dropdown a, .dropdown a:active, .dropdown a:visited {display:block;}
.dropdown a:hover {}
.dropdown .underline {height:31px;background-image:url(imgsitio/submenu.jpg);text-align:center;}
.dropdown .underline:hover {height:31px;background-image:url(imgsitio/submenu.jpg);text-align:center;}