if (document.images) {
  image11on = new Image();
  image11on.src = "images/nav/c1a-on.gif";

  image12on = new Image();
  image12on.src = "images/nav/c1b-on.gif";

  image13on = new Image();
  image13on.src = "images/nav/c1c-on.gif";

  image14on = new Image();
  image14on.src = "images/nav/c1d-on.gif";

  image15on = new Image();
  image15on.src = "images/nav/c1e-on.gif";

  image16on = new Image();
  image16on.src = "images/nav/c1f-on.gif";

  image17on = new Image();
  image17on.src = "images/nav/c1g-on.gif";

  image18on = new Image();
  image18on.src = "images/nav/c11-on.gif";



  image11off = new Image();
  image11off.src = "images/nav/c1a-off.gif";

  image12off = new Image();
  image12off.src = "images/nav/c1b-off.gif";

  image13off = new Image();
  image13off.src = "images/nav/c1c-off.gif";

  image14off = new Image();
  image14off.src = "images/nav/c1d-off.gif";

  image15off = new Image();
  image15off.src = "images/nav/c1e-off.gif";

  image16off = new Image();
  image16off.src = "images/nav/c1f-off.gif";

  image17off = new Image();
  image17off.src = "images/nav/c1g-off.gif";

  image18off = new Image();
  image18off.src = "images/nav/c11-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");
    }
  }
}