function init() {
	preloadImages();
}

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) {
		nav_schedule_over = newImage("images/nav-schedule-over.jpg");
		nav_info_over = newImage("images/nav-info-over.jpg");
		nav_history_over = newImage("images/nav-history-over.jpg");
		nav_members_over = newImage("images/nav-members-over.jpg");
		nav_photos_over = newImage("images/nav-photos-over.jpg");
		nav_contact_over = newImage("images/nav-contact-over.jpg");
		preloadFlag = true;
	}
}