Smushing Removed Images

I smushed 280 images on our site at gses.org and now most of the images are broken or missing.

I've checked and the images are in the proper server folders but they appear to have been deleted (or the link broken) in the media manager.

I tried regenerating all the thumbnails using Regenerate Thumbnails but that didn't resolve the issue.

Is there a fast/quick easy fix for this? The site is live and I don't want to leave it in this condition over the weekend.

Thanks -

Sue