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) {
		ban2_home_over = newImage("images/ban2_home-over.jpg");
		ban2_about_over = newImage("images/ban2_about-over.jpg");
		ban2_localinfo_over = newImage("images/ban2_localinfo-over.jpg");
		ban2_schools_over = newImage("images/ban2_schools-over.jpg");
		ban2_contact_over = newImage("images/ban2_contact-over.jpg");
		ban2_search_over = newImage("images/ban2_search-over.jpg");
		ban2_09_over = newImage("images/ban2_09-over.jpg");
		ban2_10_over = newImage("images/ban2_10-over.jpg");
		preloadFlag = true;
	}
}