This is a simple job for After Effects. and you can do it it with one image.
I agree with Craig - AfterEffects is the program to use. It will save a lot of unnecessary work.
I will add...if you do need to stitch 2 or 3 (or more) images together.and seamlessly create motion ..AEFX is still the choice.
It has the exact tools for the job. eg Null Object Layers, masks etc...
Would be very easy with an image of the resolution you are working with.
> The problem I'm facing is that CS5 only allows for images sized 10,000 pixels x 8,000 pixels and smaller.
That's not accuate.
The maximum frame size for a sequence is approximately that (10,240x8,192), but the maximum size for an imported image is much larger: 256 megapixels, with a maximum dimension of 32,768 pixels in either direction.
For example, an image that is 16,000×16,000 pixels is OK, as is one that is 32,000×8,000, but an image that is 35,000×10,000 pixels can’t be used.
See this page.
> The image I have is 28,800 x 14,400.
This is larger than the maximum that I just described, but not by much. So, you may be able to scale it down just a little and make use of it. You're not as far as you thought based on your initial understanding of the maximum image size.
That said, I'm always happy to recommend that people do this kind of thing in AFter Effects, so I won't dissuade you from following the advice of others to jump to After Effects for this task.
You may be onto something there Glenn...:)