var lastImageId = 0;
var smallImageId = 0;

function enlargeImage(imageId) {
  if (lastImageId > 0) {
    minimizeImage(lastImageId);
  }

  if (imageId <=2) {
    smallImageId = 1;
  } else if (imageId <=4) {
    smallImageId = 3;
  } else {
    smallImageId = 5;
  }
  lastImageId = imageId;
  Effect.Fade('smallImage' + smallImageId, { duration: 0.0 });
  Effect.Fade('smallImage' + (smallImageId + 1), { duration: 0.0 });
  Effect.Appear('largeImage' + imageId);
  return false;
}

function minimizeImage(imageId) {
  if (imageId <=2) {
    smallImageId = 1;
  } else if (imageId <=4) {
    smallImageId = 3;
  } else {
    smallImageId = 5;
  }
  Effect.Fade('largeImage' + imageId);
  Effect.Appear('smallImage' + smallImageId);
  Effect.Appear('smallImage' + (smallImageId + 1));

  return false;
}