.sen {  background-image: url(img-back/sen.gif); background-repeat: repeat-x}
.back {  background-image: url(img-back/back1.gif); background-repeat: repeat-y}
.back-tya {  background-image: url(img-back/sen_back.gif)}
.shika {  background-image: url(images/shika.gif); background-repeat: no-repeat; background-position: 400px}
.back2-1 {  background-image: url(two/img-back/back2.gif)}
.back-tyasen {  background-image: url(img-back/sen_back.gif)}