code: public static void showOverlay(Element element, boolean show) {
  
          if (show) {
              element.removeClassName(I_CmsLayoutBundle.INSTANCE.generalCss().hideOverlay());
          } else {
              element.addClassName(I_CmsLayoutBundle.INSTANCE.generalCss().hideOverlay());
          }
      }
docs: Sets a CSS class to show or hide a given overlay. Will not add an overlay to the element.<p>
  
  @param element the parent element of the overlay
  @param show <code>true</code> to show the overlay