I'm not actually sure that it is a good idea to do this, so I dont want to make it too easy. It means having two identical images in the mobi file. So if you use the go to cover function, then press next page you will see two identical images. Similarly if you press page back on the second image you will get to the first image.
And then on non Kindle viewers, like the calibre viewer which open at the proper cover, you will again see two images.
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