This is just a simple gif animation. I use corel photopaint, but there are a number of different graphics program that you can use.
When we have an image from two different angles, we can create a 3d anaglyph, or we can make an animation switching back and forth between the two images, like the type of graphic above.
As an example, what I do is, I pull up the left frame of the image - then click movie -create from document.
Then I copy the first frame into a second frame.
Then I take the right frame image and overlay it on the second frame until the object of interest is lined up as closely as possible to the first.
Once it's in line as a match, I combine the right frame image onto frame 2.
I crop the image, etc.
Then I convert the image to grayscale or palleted 8-bit (optimized) if it's in color- correct the frame rate for the internet - usually to about 35 ms between frames.
Then save it as a gif, and upload it to photobucket.
I think it is a really useful tool, especially to show people who don't have the 3d glasses - which seems to be the majority of people out there.