if (document.images) {
  image1on = new Image();
  image1on.src = "/images/nav_01r.jpg";

  image2on = new Image();
  image2on.src = "/images/nav_02r.jpg";

  image3on = new Image();
  image3on.src = "/images/nav_03r.jpg";

  image4on = new Image();
  image4on.src = "/images/nav_04r.jpg";
  
  image5on = new Image();
  image5on.src = "/images/nav_05r.jpg";
  
  image6on = new Image();
  image6on.src = "/images/nav_06r.jpg";
  
  image7on = new Image();
  image7on.src = "/images/nav_07r.jpg";
  
  image8on = new Image();
  image8on.src = "/images/nav_08r.jpg";
  
  image9on = new Image();
  image9on.src = "/images/nav_09r.jpg";
  
  image10on = new Image();
  image10on.src = "/images/nav_10r.jpg";
  
  image11on = new Image();
  image11on.src = "/images/nav_11r.jpg";
  
  image12on = new Image();
  image12on.src = "/images/nav_12r.jpg";
  
  image1off = new Image();
  image1off.src = "/images/nav_01.jpg";

  image2off = new Image();
  image2off.src = "/images/nav_02.jpg";

  image3off = new Image();
  image3off.src = "/images/nav_03.jpg";

  image4off = new Image();
  image4off.src = "/images/nav_04.jpg";
  
  image5off = new Image();
  image5off.src = "/images/nav_05.jpg";
  
  image6off = new Image();
  image6off.src = "/images/nav_06.jpg";
  
  image7off = new Image();
  image7off.src = "/images/nav_07.jpg";
  
  image8off = new Image();
  image8off.src = "/images/nav_08.jpg";
  
  image9off = new Image();
  image9off.src = "/images/nav_09.jpg";
    
  image10off = new Image();
  image10off.src = "/images/nav_10.jpg";
  
  image11off = new Image();
  image11off.src = "/images/nav_11.jpg";
   
  image12off = new Image();
  image12off.src = "/images/nav_12.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");
    }
  }
}