iBook upgrades? Follow up question.

[Jean-Paul Thuot]

A friend of mine just offered me a stick of RAM from his G4 PowerBook 
that he isn't using (he just added 1024mb).  It's PC-133, and it's 
straight from Apple via his PB.  Does anyone know if it will work in 
this iBook of mine?  G3/600/12.1/(dual usb)  I know that usually PC133 
will be backward compatible, but I am making no assumptions in this new 
Mac landscape I find myself in.

Thanks in advance,

Jean-Paul