Mohammed (SAW) in ancient scriptures
I found these really interesting. When I was really young, I heard about the Gospel of Barbabas. I coudn't say if it was fabricated or not. As for the Hindhu scriptures, supposedly they are thousands of years old and are not.
http://en.wikipedia.org/wiki/Gospel_of_Barnabas
http://www.irf.net/irf/comparativereligion/hinduism/muhammad.htm
To add to this, I heard in a lecture on video that Mohammed (SAW) is mentioned in the Torah as Mohamadim. In this instance the 'im' at the represents respect but also can be used generically as a plural.