if (document.images) {
  image1on = new Image();
  image1on.src = "nav/about_on.gif";
  image1off = new Image();
  image1off.src = "nav/about_off.gif";
  image2on = new Image();
  image2on.src = "nav/services_on.gif";
  image2off = new Image();
  image2off.src = "nav/services_off.gif";
  image3on = new Image();
  image3on.src = "nav/successes_on.gif";
  image3off = new Image();
  image3off.src = "nav/successes_off.gif";
  image4on = new Image();
  image4on.src = "nav/help_on.gif";
  image4off = new Image();
  image4off.src = "nav/help_off.gif";
  image5on = new Image();
  image5on.src = "nav/home_on.gif";
  image5off = new Image();
  image5off.src = "nav/home_off.gif";
  image6on = new Image();
  image6on.src = "nav/travel_on.gif";
  image6off = new Image();
  image6off.src = "nav/travel_off.gif";
}

function turnOn(imageName) {
  if (document.images) {
    document[imageName].src =
      eval(imageName + 'on.src');
  }
}

function turnOff(imageName) {
  if (document.images) {
    document[imageName].src =
      eval(imageName + 'off.src');
  }
}
function turnOffAll() {
  if (document.images) {
    document.image1.src = image1off.src;
//    document.image2.src = image2off.src;
////    document.image3.src = image3off.src;
//    document.image4.src = image4off.src;
  }
}