.left_img {position:absolute; left:0px; top:0px; width:231px; height:310px; background-image:url(uploads/media/sie_startseite_t3.png); background-repeat:no-repeat; z-index:2}.header { position:absolute; left:231px; top:0px; height:100px; width:773px; background-image:url(uploads/media/er_startseite.png); background-repeat:no-repeat; z-index:3}