Thank you very much.
I really appreciate your help. I understood that I can not
easily figure out with my problem and... it's hard to say, but I
give up. My project will last a long time because I have about 50
QT movies to build up with the relatives power point files ( saved
in .mov too) . I understood it's better not adding chapter in my
movies. The final user will just control movies with the forward or
backward button. I' ll think about this rebus later.