code: @Override
      public String pageHtml(int segment, String helpUrl) {
  
          return pageHtml(segment, helpUrl, null);
      }
docs: Builds the start html of the page, including setting of DOCTYPE and
  inserting a header with the content-type.<p>
  
  This overloads the default method of the parent class.<p>
  
  @param segment the HTML segment (START / END)
  @param helpUrl the url for the online help to include on the page
  
  @return the start html of the page