.left_gradient {
	background-image: url(images/left_gradient.gif);
	background-repeat: repeat-y;
}
.right_gradient {
	background-image: url(images/right_gradient.gif);
	background-repeat: repeat-y;
}
.horizontal_background {
	background-image: url(images/horizontal_background.gif);
	background-repeat: repeat-y;
	height: 100%;
}