.nav_usuario {
	height:27px;	
	width:98px;
	overflow:hidden;
	margin:0;
	padding:0;
	background-image:url(imagenes/BT_menO1.png);
}

a.nav_usuario:link, a.nav_usuario:visited, a.nav_usuario:active {
	background-image:url(imagenes/BT_menO1.png);
	display:block;
    color: #E6F4FF;
	font-weight: bold;
	font-family: Verdana, Tahoma, Arial;
	font-size:10px;	
	text-decoration:none;
	text-align:center;
	padding-top:5px;
	padding-left:4px;
	vertical-align:middle;
}

a.nav_usuario:hover {
	background-image:url(imagenes/BT_menO.png);
    display:block;
	color: #ff9933;
	font-weight: bold;
	font-family: Verdana, Tahoma, Arial;
	font-size:10px;	
	text-decoration:none;
	text-align:center;
	padding-top:5px;
	padding-left:2px;
	vertical-align:middle;
}