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

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

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

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

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

.subnav ul li.nr6  a {
	background:url(../img/anfahrt.jpg) center left no-repeat;
}