[Simplecaptcha-usage] little problem using simplecaptcha

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Hi,
  I am developping a web site in J2EE/Struts 2 and I'm using simplecaptcha for the registration.
  I have encountred a problem while displaying the captcha.

  this is my jsp page containing the captcha:
  -----------------------------------------------------------------------------------------------------------------------------------------
  <html>
  <body>
  <s:form action="Logon" method="POST">
  <tr>
  <td colspan="2">
  Login
  </td>

  <s:textfield name="cardNumber" label="Card Number"/>
  <s:password name="password" label="Password"/> 

<tr>
  <td>
  <img src="Captcha.jpg"/>
  </td>
  <td>
  <input type="text" name="response"/>
  </td>
  </tr>
  <s:submit value="Submit" align="center"/>

  </s:form>

  </body>

  </html>
  -----------------------------------------------------------------------------------------------------------------------------------------
  and this is the execute method of my Logon action

  public String execute() throws Exception {

  HttpServletRequest request = ServletActionContext.getRequest();
  HttpSession session = request.getSession();
  setResponse((String)session.getAttribute("response"));
  /*
  * Verification of the captcha response
  */
  String captchaResponse = (String) session.getAttribute(nl.captcha.servlet.Constants.SIMPLE_CAPCHA_SESSION_KEY);

  String parm = getResponse();

  if (captchaResponse != null && parm != null) {
  if (!captchaResponse.equals(parm)) {
  setResponse("error");

  return INPUT;
  }
  }

  /*
  * end of verification
  */

return SUCCESS;
  }
  -----------------------------------------------------------------------------------------------------------------------------------------

  When I first load the jsp page, it shows a captcha, but if I give a bad response and click on submit, the page doesn't display another captcha. and when I click a second time on "submit", another captcha is displayed. and whatever how many times I click on "submit" without giving a response, the servlet displays a new captcha each time.
  to be brief, the captcha doesn't appear when I load the page for the second time, but it shows on all the other times.
  what can I do to fix this?
  best regards

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