.bg_strong {
	background-attachment: scroll;
	background-image: url(images/introbig.jpg);
	background-repeat: no-repeat;
	background-position: left bottom;
}
.bg_weak {
	background-attachment: scroll;
	background-image: url(images/introfaint.jpg);
	background-repeat: no-repeat;
	background-position: right bottom;
	padding-right: 8px;
	padding-bottom: 4px;
}
.bg_weak_fader {

	background-attachment: scroll;
	background-image: url(images/introfaint_faded.jpg);
	background-repeat: no-repeat;
	background-position: right bottom;
	padding-right: 8px;
	padding-bottom: 4px;
}