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) {
		map_g_02_hokkaido_over = newImage("images/map_g_02-hokkaido_over.gif");
		map_g_02_ehime_over = newImage("images/map_g_02-ehime_over.gif");
		map_g_04_fukuoka_over = newImage("images/map_g_04-fukuoka_over.gif");
		map_g_05_ehime_over = newImage("images/map_g_05-ehime_over.gif");
		map_g_05_hiroshima_over = newImage("images/map_g_05-hiroshima_over.gif");
		map_g_05_okayama_over = newImage("images/map_g_05-okayama_over.gif");
		map_g_05_hyogo_over = newImage("images/map_g_05-hyogo_over.gif");
		map_g_06_nara_over = newImage("images/map_g_06-nara_over.gif");
		map_g_06_wakayama_over = newImage("images/map_g_06-wakayama_over.gif");
		map_g_06_osaka_over = newImage("images/map_g_06-osaka_over.gif");
		map_g_06_okayama_over = newImage("images/map_g_06-okayama_over.gif");
		map_g_06_hyogo_over = newImage("images/map_g_06-hyogo_over.gif");
		map_g_06_shiga_over = newImage("images/map_g_06-shiga_over.gif");
		map_g_06_kyoto_over = newImage("images/map_g_06-kyoto_over.gif");
		map_g_07_niigata_over = newImage("map_images/map_g_07-niigata_over.gif");
		map_g_07_niigata2_over = newImage("map_images/map_g_07-niigata2_over.gif");
		map_g_07_ishikawa_over = newImage("images/map_g_07-ishikawa_over.gif");
		map_g_07_shiga_over = newImage("images/map_g_07-shiga_over.gif");
		map_g_08_fukushima_over = newImage("images/map_g_08-fukushima_over.gif");
		map_g_08_miyagi_over = newImage("images/map_g_08-miyagi_over.gif");
		map_g_08_niigata_over = newImage("map_images/map_g_08-niigata_over.gif");
		map_g_08_niigata2_over = newImage("map_images/map_g_08-niigata2_over.gif");
		map_g_10_kagawa_over = newImage("images/map_g_10-kagawa_over.gif");
		map_g_10_ehime_over = newImage("images/map_g_10-ehime_over.gif");
		map_g_10_hyogo_over = newImage("images/map_g_10-hyogo_over.gif");
		map_g_11_aichi_over = newImage("images/map_g_11-aichi_over.gif");
		preloadFlag = true;
	}
}