Although the above idea is a good one, there maybe be just enough moisture in the frame and the photo itself this is the key to the answer.Placing the frame over a heated radiator let the whole frame heat and the glass heat up then slowly start to peel one corner. I have actually tried this method. Also remember the photo's will be still have moisture on the surface so do not try to touch the photo but let it dry in a warm room.. I would recomend as correctly stated in the first answer, and get them scanned (if u own a scanner) or a shop in town will scan them for you, they charge smg like 20p a pic or smg like that.
If you need to use reuse the glass from the frame then clean it firstly with a kitchen towel and methalated spirits, let it dry and the polish off with glass cleaner.
This is how i did mine and it worked a treat because there was initially enough moisture in the frame and the glass to create the steam.
Good luck with your photo's
Hitsbits, May 2005