WebloginPE checkbox on login?

&loginFormTpl - Lets you define a chunk that will be used for login.

If I want to include a mandatory checkbox in my login form, how to I ensure webloginPE will validate the checkbox (without hacking the class?)

I tried putting onclick JavaScript on the login <button> but it is being ignored.

OK so I just hacked the class....
Add these lines to webloginpe.class.php after line 222 (I think), Add a checkbox to your chunk with name="terms"

$terms = 0;
if(isset($_POST[’terms’])) { $terms = 1; }
if ($terms == 0)
{
$this->FormatMessage(’Please accept our terms and conditions!’);
return;
}