.c2 {  background-attachment: fixed; background-image: url(box/b_02.gif); background-repeat: repeat-x}
.c4 {  background-attachment: fixed; background-image: url(box/b_04.gif); background-repeat: repeat-y}
.c6 {  background-attachment: fixed; background-image: url(box/b_06.gif); background-repeat: repeat-y}
.c8 {  background-attachment: fixed; background-image: url(box/b_08.gif); background-repeat: repeat-x}