if (document.images) {
  image1on = new Image();
  image1on.src = "images/1nav-home-on.gif";
  image2on = new Image();
  image2on.src = "images/1nav-employ-on.gif";
  image3on = new Image();
  image3on.src = "images/1nav-reg-on.gif";
  image4on = new Image();
  image4on.src = "images/1nav-news-on.gif";
  image5on = new Image();
  image5on.src = "images/1nav-links-on.gif";
  image6on = new Image();
  image6on.src = "images/1nav-projects-on.gif";
  image7on = new Image();
  image7on.src = "images/1nav-about-on.gif";
  image8on = new Image();
  image8on.src = "images/1nav-contact-on.gif";
  image9on = new Image();
  image9on.src = "images/1nav-procurement-on.gif";
  image10on = new Image();
  image10on.src = "images/1nav-capability-on.gif";



  image1off = new Image();
  image1off.src = "images/1nav-home.gif";
  image2off = new Image();
  image2off.src = "images/1nav-employ.gif";
  image3off = new Image();
  image3off.src = "images/1nav-reg.gif";
  image4off = new Image();
  image4off.src = "images/1nav-news.gif";
  image5off = new Image();
  image5off.src = "images/1nav-links.gif";
  image6off = new Image();
  image6off.src = "images/1nav-projects.gif";
  image7off = new Image();
  image7off.src = "images/1nav-about.gif";
  image8off = new Image();
  image8off.src = "images/1nav-contact.gif";
  image9off = new Image();
  image9off.src = "images/1nav-procurement.gif";
  image10off = new Image();
  image10off.src = "images/1nav-capability.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");
  }
}