That happens because the view is set to change based on the mouse over. When you hover the cursor over the lower portion of the image, it registers as a 'mouse over' and switches the image to the back view. Now, if you haven't moved the cursor, when the portrait front image switches to the landsacpe back one your cursor is no longer over the image. That doesn't register as a 'mouse over', and no mouse over tells the code to switch back to the front image. Once the front image is up, you cursor is now over the image again and the process repeats as fast as your browser and connection will allow.
It's just a function of how the HTML code works.
It doesn't do it when your cursor is over the top half because when the image changes to the back picture, your cursor is still over the image, so the 'mouse over' condition is maintained.
-Tom
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