docs: function lazyLoad(imgs, options) {
          var setting = {
                  effect: 'fadeIn',
                  effect_speed: 10,
                  placeholder: 'data:image/gif;base64,R0lGODlhAQABAJEAAAAAAP///93d3f///yH5BAEAAAMALAAAAAABAAEAAAICVAEAOw=='
              },
              $imgs;
          if (typeof imgs === 'undefined') {
              $imgs = $('img.lazy');
          } else {
              $imgs = imgs;
          }
          if (typeof options !== 'undefined') {
              $.extend(setting, options);
          }
          $imgs.lazyload(setting);
      }