Trying to add captcha to forum registration page...

I just put up a site and my forum is getting terrible spam so I need to add a captcha to the registration page.

Here is the html code with my attempt to add a captcha module with the help of a support agent, it does not work for some reason.

<h1>Forum Registration</h1>

<div class="error">{module_error}</div>

<div class="forum-registration">

<h2>Existing Users - Login</h2>

<form method="post" action="{module_pageaddress}" onsubmit="return check_RegistrationForm(this,'login')">

    <div class="form">

    <div class="item">

    <input type="hidden" name="OrderLogin_Info" />

    <label>Username</label><br />

    <input name="Username" maxlength="255" class="cat_textbox" />

    </div>

    <div class="item">

    <label>Password</label><br />

    <input type="password" name="Password" maxlength="255" class="cat_textbox" />

    </div>

    <div class="item">

    <input type="submit" value="Login" class="cat_button" /><a href="#" onclick="document.getElementById('lostpassword').style.display='inline';return false;">Forgot your username/password?</a>

    </div>

    </div>

</form>

<form method="post" action="/LostPasswordProcess.aspx" name="catseczonelpform57982" style="display: none;" id="lostpassword">

    <h2>Forgot Password</h2>

    <div class="form">

    <div class="item">

    <label>Enter Username or Email Address</label><br />

    <input name="Username" maxlength="255" class="cat_textbox" />

    </div>

    <div class="item">

    <input type="submit" value="Retrieve" class="cat_button" /><br />

    </div>

    </div>

</form>

<hr />

<h2>New User - Registration</h2>

<form method="post" action="{module_pageaddress}" onsubmit="return check_RegistrationForm(this,'newuser')">

    <div class="form">

    <div class="item">

    <input type="hidden" name="OrderRegistration_Info" />

    <label>Name</label><br />

    <input name="Registration_Name" value="{module_RegistrationInfo,Name}" class="cat_textbox" />

    </div>

    <div class="item">

    <label>Email</label><br />

    <input name="Registration_Email" value="{module_RegistrationInfo,Email}" class="cat_textbox" />

    </div>

    <div class="item">

    <label>User Name</label><br />

    <input name="Registration_Username" value="{module_RegistrationInfo,Username}" class="cat_textbox" />

    </div>

    <div class="item">

    <label>Password</label><br />

    <input type="password" name="Registration_Password" value="{module_RegistrationInfo,Password}" class="cat_textbox" />

    </div>

    <div class="item">

    <label>Confirm Password</label><br />

    <input type="password" name="Registration_ConfirmPassword" value="{module_RegistrationInfo,ConfirmPassword}" maxlength="255" class="cat_textbox" />

    </div>

    <div class="item">

    <label>Alias</label><br />

    <input name="Registration_Alias" value="{module_RegistrationInfo,Alias}" class="cat_textbox" />

    </div>

    <div class="item">

    <label>Signature</label><br />

    <textarea type="text" rows="4" name="Registration_Signature" class="comment">{module_RegistrationInfo,Signature}</textarea>

    </div>

    <div class="item">

    <label>Enter Word Verification in box below <span class="reg">*</span></label><br />

    {module_recaptcha}</div>

    <div class="item">

    <input type="submit" value="Register" class="cat_button" />

    </div>

    </div>

</form>

</div>

<!-- END .forum-registration -->

<script type="text/javascript" src="/CatalystScripts/ValidationFunctions.js"></script>

<script type="text/javascript">

    //<![CDATA[

     function check_RegistrationForm(theForm,name) {  var why = "";  if (name == 'login') {  why += isEmpty(theForm.Username.value, "Username");  why += isEmpty(theForm.Password.value, "Password");  }  else {  why += isEmpty(theForm.Registration_Name.value, "Full Name");  why += isEmpty(theForm.Registration_Email.value, "Email Address");  why += isEmpty(theForm.Registration_Username.value, "Username");  why += isEmpty(theForm.Registration_Password.value, "Password");  why += isEmpty(theForm.Registration_ConfirmPassword.value, "Password Confirmation"); if (theForm,CaptchaV2) why += captchaIsInvalid(theForm, "Enter Word Verification in box below", "Please enter the correct Word Verification as seen in the image");  }  if (why != "") {   alert(why);   return false;  }    return true; }

    //]]>

</script>