document.writeln('<div id="captcha-block">');
  document.writeln('<input type="hidden" name="captcha_md5" value="239676553eba4fdf2ba1b03ccf4161d5" />');
  document.writeln('<img src="/authenticate/239676553eba4fdf2ba1b03ccf4161d5.png" width="125" height="35" alt="CAPTCHA Image" />');
    document.writeln('<br>');
  document.writeln('<label for="captcha_code">Enter the code shown in the image:</label>');
  document.writeln('<input type="text" id="captcha_code" name="captcha_code" value="" length="5" maxlength="5" />');
  document.writeln('</div>');