.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 {background-image:url(imgsitio/submenu.png); background-position:right;float:center;}
.dropdown .underline:hover {background-image:url(imgsitio/submenu.png);text-align:right;float:center;}