I think if you create a new template say called "activeusers" and put something like this into it...

############

<br>
<table width="100%" border="0" cellpadding="1" cellspacing="0" bgcolor="#FFFFFF">

<TR bgcolor="#6c6081" id=cat><TD colspan=6>
<FONT face="verdana, arial, helvetica" size="2" color="#f5d300"><B>Currently Active Users:</B></font><br><FONT face="verdana,arial,helvetica" size="1" >There are currently $numberregistered member(s) and $numberguest guest(s) on the boards.</font></td>
</tr>
<tr>
<td>
<table width="100%%" border="0" cellpadding="2" cellspacing="0" bgcolor="#DEDEDE">
<tr>
<td align="left" valign="middle"><FONT face="verdana,arial,helvetica" size="1" >$activeusers</font></td>
</b></font></td>
</tr>
</table>
</td>
</tr>
</table>

############

Then call it with....

###########
eval("echo dovars(\"".gettemplate("active users")."\");");
###########

It may work ????