if u want to have a comment-box, absolute identical to the attachment comment-box, make a bbcode:
bbcode
[img_comment]{TEXT}[/img_comment]
replacement
<dl class="thumbnail">
<dt></dt>
<dd>{TEXT}</dd>
</dl>
then insert your pic, write a comment with eg. one line-break under
and wrap the tag [img_comment] around:
demo
viewtopic.php?style=1&p=1365#p1365code
[img_comment][img_highslide=http://4seven.bplaced.net/forum/media/images/files/x_id_high_thumb_2_3508.jpg]http://4seven.bplaced.net/forum/media/images/files/x_id_high_2_3508.jpg[/img_highslide]
font is fixed now[/img_comment][