Large image not correct shown when there is only a small and medium image

When there is not an image for a product in the 'large' folder, but there is an image in the 'medium' folder, the small image is shown in the popup instead of the 'medium' image.

In includes\modules\pages\popup_image\header_php.php (version 2984 2006-02-07 22:00:25Z drbyte) line 53 and 56 should use "$products_image_medium" and not "DIR_WS_IMAGES . 'medium/' . $products_image_medium".

  if (!file_exists(DIR_WS_IMAGES . 'large/' . $products_image_large)) {
    if (!file_exists(DIR_WS_IMAGES . 'medium/' . $products_image_medium)) {
      $products_image_large = DIR_WS_IMAGES . $products_image;
    } else {
      $products_image_large = DIR_WS_IMAGES . 'medium/' . $products_image_medium;
    }
  } else {
    $products_image_large = DIR_WS_IMAGES . 'large/' . $products_image_large;
  }

 if (!file_exists(DIR_WS_IMAGES . 'large/' . $products_image_large)) {
    if (!file_exists($products_image_medium)) {
      $products_image_large = DIR_WS_IMAGES . $products_image;
    } else {
      $products_image_large = $products_image_medium;
    }
  } else {
    $products_image_large = DIR_WS_IMAGES . 'large/' . $products_image_large;
  }

Or even better:```
// check for a large image else use medium else use small
if (!file_exists(DIR_WS_IMAGES . 'large/' . $products_image_large)) {
$products_image_large = $products_image_medium;
} else {
$products_image_large = DIR_WS_IMAGES . 'large/' . $products_image_large;
}