#menu{
  		text-align: center;
		width: 100%;
		background: url(http://www.oa-roma.inaf.it/img/menu_bg.jpg) repeat-x;
		}
		#menu ul{
		margin: auto;
		padding:0;
		position: relative;
		left: 0px;
		display: block;
		width: 760px;
		height: 30px;
		}
		#menu li{
		list-style: none;
		float: left;
		}
		#menu ul ul{
		position: absolute;
		width: 780px;
		height: 35px;
		top: 30px;
		left: 50;
		visibility: hidden;
		background-color: #124153;
		}
		#menu li a{
		width: 152px;
		height: 30px;
		display: block;
		text-decoration:none;
		text-align: center;
                vertical-align: bottom;
		line-height: 30px;
		font-size: 15px;
		font-family: Verdana;
		color: #ffffff;
		font-weight: bold;
		background: url(http://www.oa-roma.inaf.it/img/link_bg.jpg) no-repeat top;
		} 
		#menu li a:hover{
		font-family: Verdana;
		color: #a60000;
		background-position: bottom;
		} 
		#menu ul li:hover ul{
		visibility:visible;
		z-index:2;
		}
		#menu li li a{
		width: 155px;
		height: 35px;
		line-height: 35px;
             	vertical-align: bottom;
		font-size: 14px;;
		background: #124153;
		border-right: 1px solid #ffffff;
		}
		#menu li li a:hover{
		background-color: #247593;
		}