Rebooting to OSX on iMac

Hi,
I've got an iMac from a friend that I was using to access a hard disk from a dead G4. The iMac is a G3/400Mhz/128Megs RAM with OS9.0 installed, I don't know which version of OSX is installed, though it's not Tiger.
When I got the machine it was running in OSX. I managed to get the machine to boot into OS9 but now can't reboot it in OSX, and I don't want to give it back until I've restored it to its original OS. I know this should be a simple thing to do but for the life of me can't figure it out! I've been trawling these threads but still can't find a solution.
Any advice would be gratefully recieved.

Thanks for the replies.
I have a feeling that my friend will not be able to get any further than I can!
Pressing the 'X' During startup does nothing, the machine still boots to OS9.
I've tried the option key startup and get to a screen with three buttons/icons.
On startup three buttons present themselves: a button with a circular arrow, a hard disk icon with a small os9 logo on the lower right hand side, and a button with a right facing arrow (active). Clicking on the right facing arrow launches OS9. Clicking the circular arrow seems to do nothing. The middle hard disk icon seems not to be active. Wonderfully cryptive!

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