Banned Users

[vidan]

To all helpers, advisor, mod out there, please help me on this one.

I want to make a user that has been banned, cannot see the site, only see the whiteblank pages with message, forum maintanance

then i see this code
<if condition="$bbuserinfo['usergroupid'] == 8">
<meta HTTP-EQUIV="REFRESH" content="0; url=./updates.php">
</if>

because it is work with banned usergroup, but they will see the site first, then after soon change to updates.php
how can i make
<if condition="$bbuserinfo['usergroupid'] == 8">
forum error maintanance
</if>
for the first time they enter the forum?
is there any BANNED TEMPLATES?
cause i cant find it in styles

thanks