It would be this:
Code:
<tr> <td class="smallfont" colspan="3"><fieldset class="fieldset" style="width:630px;"><legend> new thread in <strong>{vb:raw foruminfo.title}</strong></legend><div style="padding:3px"><strong>Description</strong>: {vb:raw foruminfo.description}.<br /><br /></td> </tr>
You would need a mod to enable HV just for a new thread. You could try this: create a plugin using hook newthread_start and this code:
Code:
$vbulletin->options['hvcheck'] &= $vbulletin->bf_misc_hvcheck['post'];
but I haven't tried it at all. (you would need to enable Human Verification in the Human Verification Manager, if it isn't already. You can select which actions you want verification for in the Human Verification Options (in the option, not the manager).
Edit: you might also search for an existing mod - I didn't do that.