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) {
		kyokushin_over = newImage("img/buttons/kyokushin-over.jpg");
		member_over = newImage("img/buttons/member-over.jpg");
		class_over = newImage("img/buttons/class-over.jpg");
		event_over = newImage("img/buttons/event-over.jpg");
		tournaments_over = newImage("img/buttons/tournaments-over.jpg");
		gallery_over = newImage("img/buttons/gallery-over.jpg");
		links_over = newImage("img/buttons/links-over.jpg");
		contact_over = newImage("img/buttons/contact-over.jpg");
		preloadFlag = true;
	}
}