if (document.images) {
  image1on = new Image();
  image1on.src = "http://www.kartalyst.com/website/navbox1on.jpg";

  image2on = new Image();
  image2on.src = "http://www.kartalyst.com/website/navbox2on.jpg";

  image3on = new Image();
  image3on.src = "http://www.kartalyst.com/website/navbox3on.jpg";
  
  image4on = new Image();
  image4on.src = "http://www.kartalyst.com/website/navbox4on.jpg";

  image5on = new Image();
  image5on.src = "http://www.kartalyst.com/website/navbox5on.jpg";

  image1off = new Image();
  image1off.src = "http://www.kartalyst.com/website/navbox1off.jpg";

  image2off = new Image();
  image2off.src = "http://www.kartalyst.com/website/navbox2off.jpg";

  image3off = new Image();
  image3off.src = "http://www.kartalyst.com/website/navbox3off.jpg";

  image4off = new Image();
  image4off.src = "http://www.kartalyst.com/website/navbox4off.jpg";

  image5off = new Image();
  image5off.src = "http://www.kartalyst.com/website/navbox5off.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");
    }
  }
}