Captcha problem in AddNewWizard

Hello,

 I am trying to add a captcha control as part of validation for an AddNewWizard.

I am using the captcha control from the following website:

http://www.mondor.org/captcha.aspx

The following is my code:

        MSCaptcha.CaptchaControl me = (MSCaptcha.CaptchaControl)NewUserWizard.FindControl("ccJoin");
        TextBox you = new TextBox();
        you = (TextBox)NewUserWizard.FindControl("CAPTCHA");

        me.ValidateCaptcha(you.Text);
        if (!me.UserValidated)
        {
            String yo;
            yo = ...