.nav { height: 24px; background-image:url(../img/ustmenubg.png); margin: 0 auto; width: 950px; padding:8px 0 0 0; font-size: 11px; font-family: Verdana, Arial, Helvetica, sans-serif;}

.nav ul { margin-left: 20px; padding: 0; list-style: none;}
.nav ul li { padding: 0; line-height: 24px; display: inline;}

.nav ul li a { float: left; margin: 0 5px 0 0; color: #232b00; padding: 0 0 0 10px; background: url('../img/ustmenu.gif') no-repeat left top; text-decoration: none;}
.nav ul li a span { padding: 0 10px 0 0; background: url('../img/ustmenu.gif') no-repeat right top; display: block;}

.nav ul li a:hover { color: #fff; background: url('../img/ustmenu.gif') no-repeat left -24px;}
.nav ul li a:hover span { background: url('../img/ustmenu.gif') no-repeat right -24px;}

.nav ul li.active a { color:#fff; background: url('../img/ustmenu.gif') no-repeat left -24px;}
.nav ul li.active a span { background: url('../img/ustmenu.gif') no-repeat right -24px;}