.menu_bg {  background-attachment: fixed; background-image: url(img/menu_bg.gif); background-repeat: repeat-y; background-position: left top}
.logo_bg {  background-attachment: scroll; background-image: url(img/logo_bg.gif); background-repeat: no-repeat; background-position: center center}
.netbg {  background-image: url(img/network_bg.gif); background-repeat: repeat-y; background-position: right top}