Only 1 carousel theme added on 2 carousels with 2 different themes

Issue: On a page with 2 views carousel blocks, only one is styled by theme. A custom theme is successfully loaded, but ie7 or tango are not.

Solution: use add_css() with 'theme' as second argument (like custom theme branch).

      if ($skin == 'tango' || $skin == 'ie7') {
        drupal_add_css("$jcarousel/jcarousel/skins/$skin/skin.css", 'theme');
      }

instead of:

      if ($skin == 'tango' || $skin == 'ie7') {
        drupal_add_css("$jcarousel/jcarousel/skins/$skin/skin.css");
      }

2 patches attached (stable 6.x-1.1 and 6.x-dev version)