Using external jpgs

Is it possible to have external jpg files that can be imported if and when you want them?

For example, say you have a spot set aside in your flash to display a 100x80px poster image, and you want the ability to call up a different image each time, can you have jpgs files in a directory, each set to 100x80px size, ready to be called up?

I can do it with the images set up as little flash files, but I wanted to know if you do it with raw jpgs.