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nextgen gallery: how to get picture url by gallery id

All posts in my site have custom field with nextgen gallery ID. To display gallery I use this code: $gallery_id = get_post_meta( $post->ID, 'galerijos_id', true); // Get gallery id from custom ...
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Using a custom field inside a shortocde

Im trying to use a custom field inside a shortocde for a nextgen gallery slider on a page. The goal is to change the gallery id by entering in the corresponding id on page creation with a custom ...