That will certainly work, but I was under the impression that the OP was looking for a shortcut.
The method I described would allow one to achieve the desired effect without ever having to touch the html of the document itself.
Just add a css statement or two to the stylesheet and be done.
I highly recommend your method when building your own epub, but I prefer the "less work is best" approach when simply tweaking someone else's epub for my own personal reading enjoyment.
