efficient ways to make stopmotion animation in Flash

Hello,

I'm new to Flash (using Flash CS5.5 on Mac OSX) and am trying to make a stop motion animation using photos that were created in a layered psd file and then turned into individual jpegs. There are many of them (400 and will be more) and I'm trying to find a way to make the process more automated.

What I think I want to do is import the images into the Flash library and then have each image be a blank keyframe. I can do this by copying and pasting into place each individual image, but this is way too time consuming. I assume there is some straightforward way to automate copying and pasting each images into consecutive blank keyframes... but so far haven't had much luck.

Open to other suggestions and appreciate any help!