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) {
		n01_over = newImage("images/h/n01-over.gif");
		n02_over = newImage("images/h/n02-over.gif");
		n03_over = newImage("images/h/n03-over.gif");
		n04_over = newImage("images/h/n04-over.gif");
		n05_over = newImage("images/h/n05-over.gif");
		n06_over = newImage("images/h/n06-over.gif");
		n07_over = newImage("images/h/n07-over.gif");
		n08_over = newImage("images/h/n08-over.gif");
		n09_over = newImage("images/h/n09-over.gif");
		preloadFlag = true;
	}
}
window.onload = preloadImages;