if (document.images) {
  image1on = new Image();
  image1on.src = "images/nav/btn1-on.gif";

  image2on = new Image();
  image2on.src = "images/nav/btn2-on.gif";

  image3on = new Image();
  image3on.src = "images/nav/btn3-on.gif";

  image4on = new Image();
  image4on.src = "images/btn-send-on.gif";

  image5on = new Image();
  image5on.src = "images/btn-reset-on.gif";


  image1off = new Image();
  image1off.src = "images/nav/btn1-off.gif";

  image2off = new Image();
  image2off.src = "images/nav/btn2-off.gif";

  image3off = new Image();
  image3off.src = "images/nav/btn3-off.gif";

 // image4off = new Image();
 // image4off.src = "images/btn-send-off.gif";

 // image5off = new Image();
 // image5off.src = "images/btn-reset-off.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");
    }
  }
}