Can I wipe out newer OS on ibook G4 and restore with OS 9 or 8 or even 7 so that I can run the hundreds of Educational CDs we still have at our school? We do not need to go online or be wireless or install any newer programs.

An iBook G4 can't boot Mac OS 9 or earlier but can run Classic.

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Any iBook G3 can boot Mac OS 9. The iBook G3 models that didn't have FireWire can boot 8.6, as can most PowerBook G3s. The pre-G3 PowerBooks can boot System 7.

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Look on the outside of the case to see if it has a port with a symbol similar to a Y, or compare its specifications against those of the first two computers on this list.

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Here is a link with a lot of OS info you might find interesting.

http://support.apple.com/kb/HT2191