function zoomer(event,photo)
{
  if (event.button==1)
  {
    photo.height = photo.height * 2
    photo.width = photo.width * 2
  }
  else if (event.button==0)
  {
    photo.height = photo.height * 2
    photo.width = photo.width * 2
  }
  else if (event.button==2)
  {
    photo.height = photo.height / 2
    photo.width = photo.width / 2
  }
}