Loaded Image not Refreshing

I have three photos getting imported into a flash movie, and we change these images often, but the image names remain the same. We have users reporting that the images are getting cached and not refreshing.

Here is the code I’m using to import the images:

_root.content.holder1.inner.createEmptyMovieClip("photo1", 1);

Any tips/tricks to force this image to refresh? And, will those methods cause this image to re-downloaded everytime a user visits (or refreshes) the page?