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) {
		HOME_over = newImage("images/HOME-over.gif");
		HOME_click = newImage("images/HOME-click.gif");
		TITLE_NEWS_over = newImage("images/TITLE-NEWS_over.gif");
		NEWS_over = newImage("images/NEWS-over.gif");
		NEWS_click = newImage("images/NEWS-click.gif");
		treatment_over = newImage("images/treatment-over.gif");
		treatment_click = newImage("images/treatment-click.gif");
		treatment_kiko_over = newImage("images/treatment-kiko_over.gif");
		kiko_over = newImage("images/kiko-over.gif");
		kiko_click = newImage("images/kiko-click.gif");
		good_over = newImage("images/good-over.gif");
		good_click = newImage("images/good-click.gif");
		yoshimi_good_over = newImage("images/yoshimi-good_over.gif");
		yoshimi_over = newImage("images/yoshimi-over.gif");
		yoshimi_click = newImage("images/yoshimi-click.gif");
		taiken_yoshimi_over = newImage("images/taiken-yoshimi_over.gif");
		taiken_over = newImage("images/taiken-over.gif");
		taiken_click = newImage("images/taiken-click.gif");
		preloadFlag = true;
	}
}