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Alt text for overlapping image

Bruce Dennis
I have a document that requires a smaller image layered on top of a larger image. The pdf created from document passed 508 compliance check, but on rollover only the alt text for the lager background image is visible. How can I get the alt text to show for the smaller image that's on top layer?
mikeday
Are both images just using the <img> element or similar and positioned one on top of the other?