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) {
		history_over = newImage("nav/history-over.gif");
		mission_over = newImage("nav/mission-over.gif");
		members_over = newImage("nav/members-over.gif");
		schedule_over = newImage("nav/schedule-over.gif");
		director_over = newImage("nav/director-over.gif");
		buy_over = newImage("nav/buy-over.gif");
		alumni_over = newImage("nav/alumni-over.gif");
		parents_over = newImage("nav/parents-over.gif");
		travels_over = newImage("nav/travels-over.gif");
		contact_over = newImage("nav/contact-over.gif");
		preloadFlag = true;
	}
}