making flash presentation for widescreen: help

Hi guys
I need to create some type of presentation for a video I need to make. The video is going to be presented in widescreen (16:3)

Im not sure what kind of dimensions do I need to use in the flash, what size...

Any ideas??

Thank you

Probably ansering this a bit late, however you need to know the output of your PC. Normally a 16:3 will play 1280 x 720 just fine...