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) {
		local_weather_over = newImage("images/local_weather-over.gif");
		national_news_over = newImage("images/national_news-over.gif");
		talk_back_over = newImage("images/talk_back-over.gif");
		meet_staff_over = newImage("images/meet_staff-over.gif");
		advertise_over = newImage("images/advertise-over.gif");
		subscribe_over = newImage("images/subscribe-over.gif");
		get_copy_over = newImage("images/get_copy-over.gif");
		home_over = newImage("images/home-over.gif");
		preloadFlag = true;
	}
}