var preloadImages = false;

var nav_listings_out = new Image();
var nav_services_out = new Image();
var nav_about_out = new Image();
var nav_resources_out = new Image();
var nav_contact_out = new Image();

nav_listings_out.src = "images/nav_listings_out.gif";
nav_services_out.src = "images/nav_services_out.gif";
nav_about_out.src = "images/nav_about_out.gif";
nav_resources_out.src = "images/nav_resources_out.gif";
nav_contact_out.src = "images/nav_contact_out.gif";

var nav_listings_over = new Image();
var nav_services_over = new Image();
var nav_about_over = new Image();
var nav_resources_over = new Image();
var nav_contact_over = new Image();

nav_listings_over.src = "images/nav_listings_over.gif";
nav_services_over.src = "images/nav_services_over.gif";
nav_about_over.src = "images/nav_about_over.gif";
nav_resources_over.src = "images/nav_resources_over.gif";
nav_contact_over.src = "images/nav_contact_over.gif";

preloadImages = true;

function changeImage(imgName, imgState) {

	if (preloadImages) {
	
		window.document.images[imgName].src = eval("nav_" + imgName + "_" + imgState + ".src");
		
	}
	
}