Try this:
Code:
$template_hook['navtab_end'] .= '
<a target="_blank" href="mysite1.com"><img style="margin:-2px 4px 6px 10px" src="{vb:raw fbimg}" alt="" /></a>
<a target="_blank" href="mysite2.com"><img style="margin:-2px 4px 0 0" src="{vb:raw twitterimg}" alt="" /></a>
<a target="_blank" href="mysite3.com"><img style="margin:-2px 4px 9px 0" src="{vb:raw rssimg}" alt="" /></a>
<a target="_blank" href="mysite4.com"><img style="margin:-2px 4px 0 0" src="{vb:raw skypeimg}" alt="" /></a>
<a target="_blank" href="mysite5.com"><img style="margin:-2px 4px 4px 0" src="{vb:raw ytimg}" alt="" /></a>'
--------------- Added [DATE]1304122366[/DATE] at [TIME]1304122366[/TIME] ---------------
Maybe
images/misc/facebook.png
the path relevant to your forums dir. And no / before the raw variable