// Preload Default Images
if (document.images)
{
  imgBulletNorm = new Image();
  imgBulletNorm.src = "images/bullet-gold.gif";
  imgBulletOver = new Image();
  imgBulletOver.src = "images/ptr.gif";
}

function imgNorm(name, image, extension)
{
  if (extension == "" || extension == null)
    extension = "gif";

  if (document.images)          // 3.0 or greater.
  {
    imgName = "images/" + image + "-norm." + extension;
    document.images[name].src = imgName;
  }
}

function imgOver(name, image, extension)
{
  if (document.images)          // 3.0 or greater.
  {
    if (extension == "" || extension == null)
      extension = "gif";

    imgName = "images/" + image + "-over." + extension;
    document.images[name].src = imgName;
  }
}