Replying to CS5 to CS3, HALPPPPP

herrrro everybody. so ive recently started making a website for my senior thesis final project and i downloaded cs5 on my computer thinking having the best version would be, well, the best. (yea i know theres cs7 but it was impossible to find a torrent for it)

anyways, when i went to present my work in progress on the schools computers, which only run cs3, i was able to open the .swf file fine but i couldnt open the .fla in cs3. well duh, i know that because its an older version that it might not run it. so my question is, is there a way to export my cs5 files to cs3 files through flash or another converter? and if not, am i totally screwed and have to start over?

thanks a bunch!