Settings»Layout Image Links

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Image Links Placement and Sorting Settings

$img_links['above'] = FALSE;
This settings determines where the numeral links or thumbnail links appear; above or below the image. The default is for them to appear below the image in order to reduce scrolling.
$img_links['sort_date'] = FALSE;
Sort the images by date, otherwise they're sorted alphabetically.
$img_links['sort_rev'] = FALSE;
Sort the images in reverse order.