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) {
		id23_over = newImage("img/23-over.gif");
		id24_over = newImage("img/24-over.gif");
		id25_over = newImage("img/25-over.gif");
		id26_over = newImage("img/26-over.gif");
		id27_over = newImage("img/27-over.gif");
		id28_over = newImage("img/28-over.gif");
		id29_over = newImage("img/29-over.gif");
		preloadFlag = true;
	}
}