.sp1 {
	background-image: url(../graph/sp1.gif);
	background-repeat: no-repeat;
	background-position: center;
}
.sp2 {
	background-image: url(../graph/sp2.gif);
	background-repeat: no-repeat;
}
.sp3 {
	background-image: url(../graph/sp3.gif);
	background-repeat: no-repeat;
}