.back_JS500_SSD {
	background-attachment: scroll;
	background-image: url(../images/back_JS500_SSD.jpg);
	background-repeat: no-repeat;
	background-position: center top;
	position: relative;
	visibility: visible;
}
.back_JS300_SSD {
	background-attachment: scroll;
	background-image: url(../images/back_JS300_SSD.jpg);
	background-repeat: no-repeat;
	background-position: center top;
	position: relative;
	visibility: visible;
}