Trying several approaches to get a screenshot of a known rect on the screen that has a flash video in it (that is loaded from an external site) with the click o

Trying several approaches to get a screenshot of a known rect on the screen that has a flash video in it (that is loaded from an external site) with the click of a button and then save/stream the resulting image to a PHP script to be saved to the server. The end users are not very technically savvy so teaching them Jing or even image cropping is out of the question. Currently experimenting with Flash and Java appplet solutions.