if (document.images)
{
  var img = new Image;

  img.src = "images/nav/about_nrm.jpg";
  img.src = "images/nav/coach_nrm.jpg";
  img.src = "images/nav/home_nrm.jpg";
  img.src = "images/nav/inspiration_nrm.jpg";
  img.src = "images/nav/media_nrm.jpg";
  img.src = "images/nav/products_nrm.jpg";
  img.src = "images/nav/seminar_nrm.jpg";

}

function changeimg(img, name)
{
  if (document.images)
    document.images[name].src=img;
}