That would be pretty easy to do.
Add this to your templates/ubbt_header.tmpl file right after [:"red"]<body>[/] :
[:"red"]<body>[/]<br /><a name="top" id="top"></a>
Add this to your templates/showthreaded.tmpl, right after [:"red"]$notifylinkstart[/]
[:"red"]$notifylinkstart<img src="{$config['images']}/notifymod.gif" border="0" alt="{$ubbt_lang['NOTIFY_MOD']}" title="{$ubbt_lang['NOTIFY_MOD']}" />$notifylinkstop<br />[/]<br /> <br /><a href="#top"><img src="/images/top.gif" width="27" height="15" border="0"></a><br /> Add this to your templates/showflat.tmpl, right after [:"red"] {$postrow[$i]['mailpostlink']}[/]
[:"red"]{$postrow[$i]['mailpostlink']}[/]<br /> <br /><a href="#top"><img src="/images/top.gif" width="27" height="15" border="0"></a><br />graphic included, it's pretty basic though
