code: function setBgOpacity(opacity,force,now) //{{{
        {
          if (!awake && !force) return;
          if (options.bgFade && !now) {
            $img.animate({
              opacity: opacity
            },{
              queue: false,
              duration: options.fadeTime
            });
          } else {
            $img.css('opacity', opacity);
          }
        }
docs: }}}