Well, the fix is not proper HTML, but I was getting popups for "big" images coming up with margins & scrollbars. So, here's what I did.
load up templates/showfull.tmpl
At the top, change this..
Code:
Content visible to verified customers only.
to this
Code:
Content visible to verified customers only.
And add..
Code:
Content visible to verified customers only.
before this
Code:
Content visible to verified customers only.
Now the image fits full frame in the window, no gap between the eges of the window and the image, and no scrollbars.
As I said, it's not a very technically correct chunk of HTML code just sticking body tags around willy nilly, of course, the page that comes up in the popup isn't very well HTML formatted to begin with, so it's no big deal I guess, heh.
Checked in both IE and FF (which is all that matters really), I don't know about the other browsers.