in the template the bg images is not fulscreen in some menues item:
http://psychotherapie-straub.ch/index.php/therapieangebot/kosten

i tried in CSS:
#body_bg{
background: url(/images/bg.jpg) no-repeat scroll center center;
-webkit-background-size: cover !important;
-moz-background-size: cover !important;
-o-background-size: cover !important;
background-size: cover !important;
}

but not working :S