I want to add an image to the client's system clipboard from the
browser (firefox... obviosely).
I found a way to add text to the clipboard(https://
developer.mozilla.org/en/Using_the_Clipboard), but can't find a way to
add an image.

Some folks out there suggest using the air framwork, but I don't want
my visitors to download air just to visit my page.

Hope you can help me!