if (document.images) {

	var imgPath = "images/"

	var cal1 = new Image; cal1.src = imgPath + "cal-on.gif";
	var cal0 = new Image; cal0.src = imgPath + "cal.gif";

	var yoga1 = new Image; yoga1.src = imgPath + "yoga-on.gif";
	var yoga0 = new Image; yoga0.src = imgPath + "yoga.gif";

	var reiki1 = new Image; reiki1.src = imgPath + "reiki-on.gif";
	var reiki0 = new Image; reiki0.src = imgPath + "reiki.gif";

	var prana1 = new Image; prana1.src = imgPath + "prana-on.gif";
	var prana0 = new Image; prana0.src = imgPath + "prana.gif";

	var work1 = new Image; work1.src = imgPath + "work-on.gif";
	var work0 = new Image; work0.src = imgPath + "work.gif";

	var retreats1 = new Image; retreats1.src = imgPath + "retreats-on.gif";
	var retreats0 = new Image; retreats0.src = imgPath + "retreats.gif";

}

function roll(imgName, onOff) {
	if (document.images) {
		var targetObj = eval(imgName+onOff);
		if (document.images[imgName] != null && targetObj != null) {
			document.images[imgName].src = targetObj.src;
		}
	}
}