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 preloadMenuImages() {
	if (document.images) {
		nca_home_over = newImage("images/menu/nca_home-over.gif");
		find_a_camp_over = newImage("images/menu/find_a_camp-over.gif");
		camp_jobs_over = newImage("images/menu/camp_jobs-over.gif");
		rental_and_sales_over = newImage("images/menu/rental_and_sales-over.gif");
		advertise_here_over = newImage("images/menu/advertise_here-over.gif");
		contact_us_over = newImage("images/menu/contact_us-over.gif");
		preloadFlag = true;
	}
}