If you don't want movie and music jpg's to show up as photo's, place a '.no_photo.nmj' file in your music and movie folders.
Any photo it will find in those folder and their subfolders will not be added to your photo jukebox.
This requires that you have your personal photo's in different folders then your music and video pictures.
After adding this file, you'll have to do a full rescan to clear up the database though.
There are some variants to this file as well:
.no_all.nmj : nothing in this folder and subfolders will be scanned
.no_video.nmj : no video's will be scanned from this folder and it's subfolders