Updated and integrated with Form Hack...
All that's needed is to add this to your new forms and use xml in zip...
HTML Code:
<tr>
<td class="text_field_question question" colspan="3" align="center">
Please enter confirmation code displayed below:<br />
<img src="image_match.php?regen=y&<?php echo time(); ?>" />
<input type="text" name="code" /><br /><br /></td>
</tr>