if you're not seing that alert "From AS", you probably have incorrect swf embedding code. to remedy, use the embedding code published by flash.
i wouldn't expect your addCallback is going to work. to remedy, check the flash help files for sample callback code.
After remove/reinstall Flash CS4, I cahnged above allowscriptaccess to "always". This time, it works in IE8 but FF shows "a.f100 is not a function"?
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a.f100 makes no sense.
Interesting. Have you ever tried callback yourself?