Remove admin from who's online

[The Tea]

I don't want to show up in the Who's Online stuff, on the full page or on the "viewing forum" area on the individual forums.

I am already set to invisible and only moderators can view the people who have chosen to be invisible.

But I don't want them to be able to see me either. Is there some hack I can put in place in the Who's Online template to only show certain usergroups?

Thanks in advance