div#siteContent.foto1{background: url(../images/achter_sitecontent_service_1.jpg) no-repeat top;}
div#siteContent.foto2{background: url(../images/achter_sitecontent_service_2.jpg) no-repeat top;}
div#siteContent.foto3{background: url(../images/achter_sitecontent_service_3.jpg) no-repeat top;}
div#siteContent.foto4{background: url(../images/achter_sitecontent_service_4.jpg) no-repeat top;}