.subnav ul li.nr1 a {
	background:url(../img/philosophie.jpg) center left no-repeat;	
}

.subnav ul li.nr2 a {
	background:url(../img/mitarbeiter.jpg) center left no-repeat;
}

.subnav ul li.nr3 a {
	background:url(../img/opensource.jpg) center left no-repeat;
}

.subnav ul li.nr4 a {
	background:url(../img/kontakt.jpg) center left no-repeat;
}

.subnav ul li.nr5  a {
	background:url(../img/anfahrt.jpg) center left no-repeat;
}