--
-- wp_presentation__get_background/1
--
create or replace function wp_presentation__get_background(
  integer
) returns text as $$

declare 
    pres_item_id    alias for $1;
begin
    return content
    from cr_revisions, cr_items
    where cr_items.content_type = 'cr_wp_presentation_bak'
    and cr_items.parent_id = p_pres_item_id
    and cr_revisions.revision_id = cr_items__live_revision;
end;$$ language plpgsql;