function showMainImage(file, title)
{
  var img = getImage("mainimage");
  if (img != null)
  {
    var path = file;
    img.src = path;
    img.alt = title;
  }
}
function changeThumb(id, path)
{
	var img = getImage(id);
	if (img != null)
	{
		img.src = path;
	}
}
function getImage(id)
{
  if (document.getElementById)
  {
    return document.getElementById(id);
  }
  else if (document.images && document.images(id))
  {
    return document.images(id);
  }
  return null; 
}