home_on = new Image();   home_on.src = "images/n_home_on.gif";
home_off = new Image();  home_off.src = "images/n_home.gif";

profile_on = new Image();   profile_on.src = "images/n_profile_on.gif";
profile_off = new Image();  profile_off.src = "images/n_profile.gif";

product_on = new Image();   product_on.src = "images/n_product_on.gif";
product_off = new Image();  product_off.src = "images/n_product.gif";

benefit_on = new Image();   benefit_on.src = "images/n_benefit_on.gif";
benefit_off = new Image();  benefit_off.src = "images/n_benefit.gif";

clients_on = new Image();   clients_on.src = "images/n_clients_on.gif";
clients_off = new Image();  clients_off.src = "images/n_clients.gif";

services_on = new Image();   services_on.src = "images/n_services_on.gif";
services_off = new Image();  services_off.src = "images/n_services.gif";

contact_on = new Image();   contact_on.src = "images/n_contact_on.gif";
contact_off = new Image();  contact_off.src = "images/n_contact.gif";

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}