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) {
		ban_home_over = newImage("images/ban_home-over.jpg");
		ban_about_over = newImage("images/ban_about-over.jpg");
		ban_history_over = newImage("images/ban_history-over.jpg");
		ban_show_over = newImage("images/ban_show-over.jpg");
		ban_artists_over = newImage("images/ban_artists-over.jpg");
		ban_ml_over = newImage("images/ban_ml-over.jpg");
		ban_artinfo_over = newImage("images/ban_artinfo-over.jpg");
		ban_contact_over = newImage("images/ban_contact-over.jpg");
		ban_logo_over = newImage("images/ban_logo-over.jpg");
		preloadFlag = true;
	}
}