Swapping authors of media and posts

Ok here is the situation

Somewhere along the line of moving my site currently to a new host two of the users got messed up. The admin which most of the posts and pages and media should be listed as being authored by are now set to one of my subscribers. She hasn’t been given any special privileges or anything just credit for a great deal of previous posts and images and such. I manually can fix the problem with the posts and pages and have but the images and media don’t have the ability to swap authors… so my question is does anyone know of a quick way to give any images authored by one user to the other without having to delete the user and give there stuff to someone else. I am trying to avoid that because then we have to recreate and sign up the subscriber for their subscription and get them new passwords and everything since you can’t just copy their old one from the database. Ideas? I appreciate the assist everyone.