var preloadImages = false;

var nav_home_out = new Image();
var nav_consulting_out = new Image();
var nav_managed_out = new Image();
var nav_case_out = new Image();
var nav_contact_out = new Image();

nav_home_out.src = "images/nav_home.jpg";
nav_consulting_out.src = "images/nav_google_apps.jpg";
nav_managed_out.src = "images/nav_IPVoIP.jpg";
nav_case_out.src = "images/nav_case.jpg";
nav_contact_out.src = "images/nav_contact.gif";

var nav_home_over = new Image();
var nav_consulting_over = new Image();
var nav_managed_over = new Image();
var nav_case_over = new Image();
var nav_contact_over = new Image();

nav_home_over.src = "images/nav_home_on.jpg";
nav_consulting_over.src = "images/nav_google_apps_on.jpg";
nav_managed_over.src = "images/nav_IPVoIP_on.jpg";
nav_case_over.src = "images/nav_case_on.jpg";
nav_contact_over.src = "images/nav_contact_on.gif";

preloadImages = true;

function changeImage(imgName, imgState) {

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