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) {
		japanese_not_over = newImage("images/japanese_not-over.gif");
		english_not_over = newImage("images/english_not-over.gif");
		menu_top_over = newImage("images/menu_top-over.gif");
		menu_artist_over = newImage("images/menu_artist-over.gif");
		menu_program_over = newImage("images/menu_program-over.gif");
		menu_commentary_over = newImage("images/menu_commentary-over.gif");
		menu_tickets_over = newImage("images/menu_tickets-over.gif");
		menu_access_over = newImage("images/menu_access-over.gif");
		menu_about_over = newImage("images/menu_about-over.gif");
		menu_pre_over = newImage("images/menu_pre-over.gif");
		menu_faq_over = newImage("images/menu_faq-over.gif");
		menu_contact_over = newImage("images/menu_contact-over.gif");
		menu_merchandise_over = newImage("images/menu_merchandise-over.gif");
		preloadFlag = true;
	}
}