function imageWidth (fileName)
{
  var image = new Image ();
  var tryLimit = netscape ? 1000 : 10000;
  var tries = 0;
  var width = 0;
  while ((width == 0) && (tries < tryLimit))
  {
    image.src = fileName;
    width = image.width;
    tries += 1;
  }
  if (width < 20)
    return 0;
  return width;
}

function imageHeight (fileName)
{
  var image = new Image ();
  var tryLimit = netscape ? 1000 : 10000;
  var tries = 0;
  var height = 0;
  while ((height == 0) && (tries < tryLimit))
  {
    image.src = fileName;
    height = image.height;
    tries += 1;
  }
  if (height < 20)
    return 0;
  return height;
}