.navdh li.active{background-image: url(dfiles/9033/pkuef/images/menuback.jpg);
    background-repeat: no-repeat;
    background-position: center center;
    color: rgb(154, 0, 0);}
.navdh li:hover a{background-image:url(dfiles/9033/pkuef/images/menuback3.jpg);color:#fff;}