if (document.images) {
  image01on = new Image();
  image01on.src = "images/nav_01r.jpg";

  image02on = new Image();
  image02on.src = "images/nav_02r.jpg";

  image03on = new Image();
  image03on.src = "images/nav_03r.jpg";  
  
  image04on = new Image();
  image04on.src = "images/nav_04r.jpg";

  image05on = new Image();
  image05on.src = "images/nav_05r.jpg";

  image06on = new Image();
  image06on.src = "images/nav_06r.jpg";  
 
  image07on = new Image();
  image07on.src = "images/nav_07r.jpg"; 
  
  image50on = new Image();
  image50on.src = "images/nav_homer.jpg";  

  image01off = new Image();
  image01off.src = "images/nav_01d.jpg";

  image02off = new Image();
  image02off.src = "images/nav_02d.jpg";

  image03off = new Image();
  image03off.src = "images/nav_03d.jpg";

  image04off = new Image();
  image04off.src = "images/nav_04d.jpg";
  
  image05off = new Image();
  image05off.src = "images/nav_05d.jpg";
  
  image06off = new Image();
  image06off.src = "images/nav_06d.jpg";
  
  image07off = new Image();
  image07off.src = "images/nav_07d.jpg";
  
  image50off = new Image();
  image50off.src = "images/nav_home.jpg";

}

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");
    }
  }
}