.back {
	background-attachment: scroll;
	background-image: url(../img/back.jpg);
	background-repeat: repeat-x;
	background-position: center top;
}
.left {
	background-attachment: scroll;
	background-image: url(../img/img_02.jpg);
	background-repeat: no-repeat;
	background-position: left bottom;
}
.right {
	background-attachment: scroll;
	background-image: url(../img/img_04.jpg);
	background-repeat: no-repeat;
	background-position: right bottom;
}