how to make a os9 boot disc for imac g3

Just out of interest, do you have a copy of Mac OS 9 already or a OS 9 partition on a Mac. If your iMac supports it, FireWire Target Disc Mode could be a way to boot the iMac (Works with my iMac G3/500 - and is how I put my copy os OS 9.1 on it).

The OS 9 Disc that came with your mini is unsuitable for use on your Mini as it is designed to be used within the OS X Classic environment. One thing you could try is cloning your iBooks 9.2.2 drive to the iMac (use an USB enclosure for both, and something like Carbon Copy Cloner) to do this. Just out of interest, why dont you put OS X on the iMac (Mine has 10.3 and 10.4 on it and both work fine).

no legal way
you can purchase osx cd version , so you dont need a dvd drive