P.S. I'm not so sure about those paths to the css and js either. Make sure they are correct in view source. See if they show at all in the view source. It may be there but not working due to a bad path.
Do this then for the chat condition....
HTML Code:
<if condition="$bbuserinfo[field15] == 1 AND THIS_SCRIPT != 'chat' AND is_member_of($bbuserinfo, 5, 7, 6, 16, 12, 11, 17, 10, 13, 9)">
<!-- CometChat Footer Code Start -->
<link type="text/css" rel="stylesheet" media="all" href="/cometchat/cometchatcss.php" charset="utf-8" />
<script type="text/javascript" src="/cometchat/cometchatjs.php" charset="utf-8"></script>
<!-- CometChat Footer Code End -->
</if>