code: public String dialogSubheadline(String headline) {
  
          StringBuffer retValue = new StringBuffer(128);
          retValue.append("<div class=\"dialogsubheader\" unselectable=\"on\">");
          retValue.append(headline);
          retValue.append("</div>\n");
          return retValue.toString();
      }
docs: Builds a subheadline in the dialog content area.<p>
  
  @param headline the desired headline string
  
  @return a subheadline element