i was just playing around with this in jQuery and iBooks does (with flowing books anyway) have a quirky way of handling the .hide() and .show() methods. the initial states of elements appear to be enforced somehow (or iBooks is interfering with jQuery's data cache), so toggling display:none/display:block, for example, i couldn't get to work.
i did get the hide/show working by toggling a class that changes the visibility and position of the images, though.
hope that helps.
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