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_shiga_over = newImage("images/map_01-shiga_over.gif");
		map__01_fukuoka_over = newImage("images/map_01-fukuoka_over.gif");
		map__01_hiroshima_over = newImage("images/map_01-hiroshima_over.gif");
		map__01_oosaka_over = newImage("images/map_01-oosaka_over.gif");
		map__01_kouto_over = newImage("images/map_01-kouto_over.gif");
		map__01_nagoya_over = newImage("images/map_01-nagoya_over.gif");
		map__01_ishikawa_over = newImage("images/map_01-ishikawa_over.gif");
		map__01_tokyo_over = newImage("images/map_01-tokyo_over.gif");
		map__01_sendai_over = newImage("images/map_01-sendai_over.gif");
		map__01_sapporo_over = newImage("images/map_01-sapporo_over.gif");
		map_osaka_01_ImageMap_01_over = newImage("images/map_osaka_01-ImageMap_01_ov.gif");
		map_osaka_01_ImageMap_02_over = newImage("images/map_osaka_01-ImageMap_02_ov.gif");
		preloadFlag = true;
	}
}