I think you want to modify the skeleton for all pages.
If you are running version 1.3, it is in templates/whtml_slim.pt
If you are running version 1.4, it is in skins/monobook.php (here, I
guess that you didn't change the default layout. If you changed the skin
to something else as monobook (let's call it myskin), then you need to
(I'm only suming up what I've learned this week... hope I understood
what Jamie said previously)
I'm sure that this has come up before but I can't find it. I want to add a
stat counter from one of the external services to the footer of my
mediawiki, so that it is on all pages. I can't seem to find which files or
where I would put this.
Any help would be appreciated.