Can you put the link here to your new thread (allthough I don't think this is off topic, since it all has to do with installing the OS...)
I will put the following with some explanations you might allready know, but I think, if there is someone else who joins latwer, he can benefit from it.
Other ways:
1. scenario (you have 1 iMac G3 and a OS 9 CD and Panther CD):
put the OS 9 CD in and install, then connect to the internet and check for the latest firmwareupdate (needed to install OS 10.2, 10.3 or 10.4, not needed for 10-10.1), it is a newer one then that linked to on djonmac.com For safety reasons first install the one linked to at djonmac.com, then after that download this one
http://docs.info.apple.com/article.html?artnum=75130
Easiest way to connect to the internet would be plugging in the LAN-cable (ethernet). (If you have another Mac at hand it maybe possible to download the firmware-installer on this and then transfer it to the other mac (viaburned CD or target mode, for explanation of target mode see scenario 2).
If you have then updated the fimrware, you can just put in the CD of Panther and partitition the HDD. Then install Panther in one of the partitions (because OS 9 doesn't need to be on it).
Reboot. then insert OS 9 CD and install on the other partitition.
Scenario 2 (you have two Macs).
Plug firewire cable into both. Start one. Start the second while holding down "T" on the keyboard of Mac No 2.
A purple screen appears (this is target mode).
On Mac 1, you will see an external harddrive. now you can partition the "external" Mac and after partitioning drag and drop the systemfolder on your Mac 1 on the partition of Mac2.
This will only work on firewire equipped Macs.
Here is something really helpful:
http://discussions.apple.com/thread.jspa?threadID=1335173
PS: !!! I forgot something important, you will have to start from the panther CD, when one wants to use the Partititioning Application.
Note: Apple says, updating the firmware can cause some RAM to not work anymore
http://support.apple.com/kb/TA26424 (so maybe, if you mac won't start up after updating, you should change the RAM) (?)
IMPORTANT !! Read this first, to get the right firmware
http://support.apple.com/kb/HT1395?viewlocale=en_US