I just spent a very frustrating day wrangling with cached images. Both JavaScript and Flash have trouble updating dymanic images, when these are cached by the browser. This can be a problem if, for example, your website has sets of images, such as catalogues, that could be updated at any time. Or if the website needs to constantly reload a single image with the same filename, such as a self-updating webcam image.
In my case, it was both. After delving into numerous Internet sources, with some trial and even more error, I finally distilled a solution that, with slight adjustments, works for both JavaScript and Flash.
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