I have an iBookg4, and I was just given a 19 inch monitor.  I want to use both as SEPERATE screens, I hook it all up and they both come up as the same screen.  OK.  The problem is when I go to the system preferences and click displays, there is no option to change the settings for adding different screen (i.e.-use 2 as seperate monitors).  The only options it gives me is to change the color and the resolution.  I have talked to my boss at work and he uses a powerbook and does this all the time (using 2 screens seperately, and the option in his display preferences is there).  Any help on this is appreciated.  I really want to use this nice screen I have.