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) {
		Index_over = newImage("layout/Index-over.png");
		About_over = newImage("layout/About-over.png");
		FAQ_over = newImage("layout/FAQ-over.png");
		Down_over = newImage("layout/Down-over.png");
		Links_over = newImage("layout/Links-over.png");
		preloadFlag = true;
	}
}