get_post_custom: get image URL instead of image ID

If its your own custom post type you should know the field names? Iterate through the fields – or better just get the required field – an then use the attachment Id with wp_get_attachment_image_src.

http://codex.wordpress.org/Function_Reference/wp_get_attachment_image_src

Chech the codex for further examples and Google for “WordPress custom post type fields”.

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