code: public void addHiddenParam(PrintWriter out, String strParam, String strValue)
      {
          out.println("<input type=\"hidden\" name=\"" + strParam + "\" value=\"" + strValue + "\">");
      }
docs: Add this hidden param to the output stream.
  @param out The html output stream.
  @param strParam The parameter.
  @param strValue The param's value.