duplicate id for and

Thanks for the great plugin, using it for ages already 🙂

The following markup generated by the plugin is not valid though, because the same id is used for the <p> and the <input> tag. Could this be fixed? I guess the <p> should have a different id?

<p id="si_captcha_code">
<input id="si_captcha_code" name="si_captcha_code" type="text" />
<label for="si_captcha_code" >CAPTCHA Code</label><span class="required">*</span>
</p>