There wasn't any doctoring done on the photo.

You're stating your uninformed opinion as if it were a fact. There's plenty
of evidence that suggests it was doctored.

Go to the second link (the
one for Fox) and go through the 6 or 7 photos of the debate. The 4th
photo
shows both candidates on the stage at their podiums. It is very easy to
determine a height difference exists.

It's easy in a simplistic way. You're making some assumptions, such as the
horizon being level (its not). You're also assuming that the camera is
centered between the two podiums (it's not) and that the camera to podium
distance is exactly the same between each speaker (it's not). If anything,
the photo is skewed slightly towards exaggerating the height difference
between Kerry and Bush.

Wouldn't Fox need to doctor all of
the photographs?

So what. That's an hour's work for a rank beginner. I'm sure the
image-doctoring artists at Fox, with all their experience, are much faster
than that.