[NuclioN]

Horizontal display:

recent_attachments:

<a href="attachment.php?attachmentid=$recentattachment[attachmentid]" target="_blank">
<img src="attachment.php?attachmentid=$recentattachment[attachmentid]" alt="$recentattachment[filename]" width="62" height="62" border="0"></a> <img src="./spacer.gif" height="0" width="90" border="0">

Under $navbar:

<table class="tcat" cellpadding="0" cellspacing="0" border="0" width="100%" align="center" valign="top">
<tr><td>
$latestattachments
</td></tr></table>

well..this is not 100% proper code but it looks ok on our forum. Untill it is better coded this is an option. You can upload a transparant spacer gif to the right dir. and force the space between the thumbnails in the desired width. Keep also in mind that altough it is a thumb the images have the full kb load on the forumhome.