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) {
		shop_over = newImage("images/menu/shop-over.jpg");
		artist_over = newImage("images/menu/artist-over.jpg");
		event_over = newImage("images/menu/event-over.jpg");
		culture_over = newImage("images/menu/culture-over.jpg");
		beauty_over = newImage("images/menu/beauty-over.jpg");
		life_over = newImage("images/menu/life-over.jpg");
		menu_bar_shop_over = newImage("images/menu/menu_bar-shop_over.jpg");
		menu_bar_artist_over = newImage("images/menu/menu_bar-artist_over.jpg");
		menu_bar_event_over = newImage("images/menu/menu_bar-event_over.jpg");
		menu_bar_culture_over = newImage("images/menu/menu_bar-culture_over.jpg");
		menu_bar_beauty_over = newImage("images/menu/menu_bar-beauty_over.jpg");
		menu_bar_life_over = newImage("images/menu/menu_bar-life_over.jpg");
		preloadFlag = true;
	}
}