function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		headH_over = newImage("img/headH-over.gif");
		headOf_over = newImage("img/headOf-over.gif", "img/headover-Of.gif");
		headOd_over = newImage("img/headOd-over.gif", "img/headover-Od.gif");
		headR_over = newImage("img/headR-over.gif", "img/headover-R.gif");
		headA_over = newImage("img/headA-over.gif", "img/headover-A.gif");
		headY_over = newImage("img/headY-over.gif");
		preloadFlag = true;
	}
}