#outerback_yellow {
    background: transparent url('../img/back_gelb_1024_beschnitt.jpg') no-repeat 50% 0px;   
}
#outerback_blue {
    background: transparent url('../img/back_blau_1024_beschnitt.jpg') no-repeat 50% 0px;   
}
#outerback_white {
    background: transparent url('../img/back_white_1024_beschnitt.jpg') no-repeat 50% 0px;   
}
#outerback_orange {
    background: transparent url('../img/back_orange_1024_beschnitt.jpg') no-repeat 50% 0px;   
}
#outerback_red {
    background: transparent url('../img/back_red_1024_beschnitt.jpg') no-repeat 50% 0px;   
}
#outerback_green {
    background: transparent url('../img/back_gruen_1024_beschnitt.jpg') no-repeat 50% 0px;   
}