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_01_hiroshima_m_over = newImage("map/map_01-hiroshima_over.gif");
		map_01_ishikawa_m_over = newImage("map/map_01-ishikawa_over.gif");
		map_01_sapporo_m_over = newImage("map/map_01-sapporo_over.gif");
		map_01_sendai_over = newImage("map/map_01-sendai_over.gif");
		map_01_toukyo_m_over = newImage("map/map_01-toukyo_over.gif");
		map_01_nagoya_m_over = newImage("map/map_01-nagoya_over.gif");
		map_01_shiga_over = newImage("map/map_01-shiga_over.gif");
		map_01_kyouto_m_over = newImage("map/map_01-kyouto_over.gif");
		map_01_oosaka_m_over = newImage("map/map_01-oosaka_over.gif");
		map_01_fukuoka_m_over = newImage("map/map_01-fukuoka_over.gif");
		map_01_kyouto_over = newImage("map/map_01-kyouto_over.gif");
		map_01_ishikawa_over = newImage("map/map_01-ishikawa_over.gif");
		map_01_sapporo_over = newImage("map/map_01-sapporo_over.gif");
		map_01_sendai_over015 = newImage("map/map_01-sendai_over-15.gif");
		map_01_toukyo_over = newImage("map/map_01-toukyo_over.gif");
		map_01_nagoya_over = newImage("map/map_01-nagoya_over.gif");
		map_01_hiroshima_over = newImage("map/map_01-hiroshima_over.gif");
		map_01_oosaka_kita_over = newImage("map/map_01-oosaka_kita_over.gif");
		map_01_oosaka_minami_over = newImage("map/map_01-oosaka_minami_over.gif");
		map_01_fukuoka_over = newImage("map/map_01-fukuoka_over.gif");
		preloadFlag = true;
	}
}