There's no point in reinventing the wheel for that solution...
This is a free flash-based slideshow app that will solve your problem quick, and if you dont like that one, try google'ing Flash-based slidewhow...
http://www.flshow.net/carousel_download.php - by the way, it is FREE
Flex would probably do what you want, but you would be a ways off from deployment, and learning it to solve this problem seems like overkill.
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