need to rotate video clips! Help please

Hey guys,

I filmed a bunch of skiing with a helmet cam, and the camera mounted upside down. So now I have a bunch of video clips that need rotated 180*. I'm using iMovie 7.1.4, any advice? This is really pissing me off, I downloaded an add-on that was supposed to allow a rotate feature for imovie, but to use the add on I need to be able to go into "effects" which apparently does not exist in 7.1.4...

thanks everyone