Who's online reduction

[Shanj]

I'd really like to cut eveything out of the who's online block except - who's online. I only have members so no guests. I want to cut everything so my who's online just says

"There are 1 members online."

So it would cut like this:

""There are [currently] 1 members[ and 0 guests on-line]"

and also as we are an intentionally small community, cut
[Most users ever online was X on 12th-October-2006 at 09:53 am.]

I located online.php and usually I can tweak code enough to cut out extras I don't want because thre's enough recognisable chunks from the html source text. I then copy the original php or whatever as a backup before I start mucking about.
But I couldn't see how to get started.
Please could someone give me some pointers like the sections to look at, and their starter/end brackets, and maybe even a warning on important bits not to touch.
As I said I will have a txt file copy to replace all if I muck up.