What are you talking about "flip the image dynamically"? The Javascript only changes the file name, what you may need to do is preload the image (i.e. make it really small and just use an <img> tag to load it in the browser) I'm not 100% sure but that might be why. Have you checked the source code of the page to see if it has been changed (when you collapse it).
A direct link might aid others trying to assist you.
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