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  $all_regions = system_region_list($theme);

  $item = menu_get_item();

    // Load all region content assigned via blocks.

    foreach (array_keys($all_regions) as $region) {

      // Assign blocks to region.

  }

  else {

    // Append region description if we are rendering the regions demo page.

    if ($item['path'] == 'admin/structure/block/demo/' . $theme) {

      foreach (system_region_list($theme, REGIONS_VISIBLE, FALSE) as $region) {

        $description = '<div class="block-region">' . $all_regions[$region] . '</div>';