#20 spacer image not working in Guestbook

[Loren]

Line 27 of skin_registry_guestbook -- bit add_comment.
It has old IPB code (for a variable call).

Old:
<img src='{ipb.vars['img_url']}/spacer.gif' alt='' width='160' height='1' />

It should be:
<img src='{$this->ipsclass->vars['img_url']}/spacer.gif' alt='' width='160' height='1' />