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if (document.images) {
  image1on = new Image();
  image1on.src = "images/factory/factory1a.jpg";

  image1off = new Image();
  image1off.src = "images/factory/factory1b.jpg";

}

if (document.images) {
  image2on = new Image();
  image2on.src = "images/factory/factory2a.jpg";

  image2off = new Image();
  image2off.src = "images/factory/factory2b.jpg";

}

if (document.images) {
  image3on = new Image();
  image3on.src = "images/factory/factory3a.jpg";

  image3off = new Image();
  image3off.src = "images/factory/factory3b.jpg";

}

if (document.images) {
  image4on = new Image();
  image4on.src = "images/factory/factory4a.jpg";

  image4off = new Image();
  image4off.src = "images/factory/factory4b.jpg";

}

if (document.images) {
  image5on = new Image();
  image5on.src = "images/factory/factory5a.jpg";

  image5off = new Image();
  image5off.src = "images/factory/factory5b.jpg";

}

if (document.images) {
  image6on = new Image();
  image6on.src = "images/factory/factory6a.jpg";

  image6off = new Image();
  image6off.src = "images/factory/factory6b.jpg";

}

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");
  }
}
-->