#menu1, #menu1:visited {
	background-image: url(../rollover_images/01_wfl.gif);
}
#menu2, #menu2:visited {
	background-image: url(../rollover_images/02_1974.gif);
}
#menu3, #menu3:visited {
	background-image: url(../rollover_images/03_1975.gif);
}
#menu4, #menu4:visited {
	background-image: url(../rollover_images/04_multimedia.gif);
}
.rollover span.alt {
	display: none;
}
.rollover img {
	border: none;
}
:root .rollover img {
	display: block;
}
.rollover, .rollover:visited {
	background-color: transparent !important; /* needed for Opera5/6 */
	background-repeat: no-repeat;
	background-position: 0 0;
}
.rollover:hover, .rollover:focus, .rollover:active, .rollover.MMO, .rollover.MMO:visited {
	background-position: 0 -25px;
}