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) {
			button_home_over = newImage("images/button_home-over.gif");
			button_why_over = newImage("images/button_why-over.gif");
			button_what_over = newImage("images/button_what-over.gif");
			button_how_over = newImage("images/button_how-over.gif");
			button_faqs_over = newImage("images/button_faqs-over.gif");
			button_hints_over = newImage("images/button_hints-over.gif");
			button_where_to_buy_over = newImage("images/button_where_to_buy-over.gif");
		preloadFlag = true;
	}
}