Browse for file with flash

Is anybody able to figure out what’s wrong with this (or specifically
why it doesn’t work in mac browsers)?

http://home.graffiti.net/flash_help:graffiti.net/

I’ve tried lots of different options including the yamago component
(http://www.yamago.net/components/). The yamago component works but I
don’t like the complexity of the code, it’s difficult to edit. It also
doesn’t work in safari on a MAC.

My example above is the simplest version I’ve been able to get working
but unfortunately only on PC.

Any ideas?