how install this mod?!

Is there any way to just display specific usergroups?

You would need to modify the query to do this.

I'm trying to find a staff online (ie admins / moderator) sideblock. I am not 100% familiar with modifying the query. Is it difficult?

It's not that difficult to modify the query, iirc. However, I could have sworn I've seen a Staff Online widget (or was it a forum block?), so you may want to try a search.

i would like the staff only online block...

and i just searched for it no results

I have searched and have came up with no results. I used to run IPB and know they have one, but vBulletin does not.

I would like the forum block, not the widget. Since this is your mod a) would you mind if I modified query and b) could you give any insight or a starting point as I am not an expert.

Thanks

I don't care if you modify the query - do whatever you want with this mod. You'll probably want to change the template. And then in the query, you'll want to add to the WHERE part something like:
AND user.usergroupid IN ('5', '6')

(NOT TESTED!!!!)

Lynne toy should code your own on your own time. Ill be the first to install .but im going to try what you said

I tried to add that code and had no success. I hope someone makes this mod one day!