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) {
		nav_plants_over = newImage("image/nav-plants-over.gif");
		nav_plantsearch_over = newImage("image/nav-plantsearch-over.gif");
		nav_featuredplants_over = newImage("image/nav-featuredplants-over.gif");
		nav_wheretobuy_over = newImage("image/nav-wheretobuy-over.gif");
		nav_login_over = newImage("image/nav-login-over.gif");
		nav_contact_over = newImage("image/nav-contact-over.gif");
		nav_about_over = newImage("image/nav-about-over.gif");
		nav_home_over = newImage("image/nav-home-over.jpg");
		nav_availability_over = newImage("image/nav-availability-over.gif");
		nav_staffmusings_over = newImage("image/nav-staffmusings-over.gif");
		preloadFlag = true;
	}
}