Many webistes have their images split for different reasons, like making it a bit more difficult to viewers to save some image, or allowing pages to load more quickly.
Well, as this BBS is the most likely place where someone will come up with an answer, my question is, is there some app that allows you to select split images, and saves them as an only file?
I know someone must have figured this out, it can't be that difficult..

When I come across that, I just hit the Print Screen button. This captures the screen to the clipboard. Then I paste it into Photoshop. Dirty, but gets the job done.

Open up all the images. Select one and enlarge the canvas size by however much you need to, with the original image anchored to one corner.

From the other images, select all, cut and paste into the first image and line it up.

I've done this with photoshop actions before - but you have to have all the images the same size, which makes it less useful.

Well that's exactly what I'm trying to avoid... doing that with one or two files is okay, but when you've got at least 100 images it turns not practical.
Well, I'll keep searching.

Reggie, I don't know of any software that does this automatically the way I think you want it done.

I think the printscreen trick is the closest to "easy" you're going to get with it.