IMac G4 / "Downgrading" to Tiger from Leopard / Installing(?) OS 9/Classic

Hey guys, I have an old iMac G4 (1.0 GHz, 17") that I bought used - it's in great shape, but it has been upgraded to Leopard 10.5.8 and I don't have the original discs. I got the computer because I have several programs I'd like to run via OS 9 "Classic" mode (mostly for nostalgia's sake). I have the following questions:
1. Is it possible to somehow "downgrade" the computer to Tiger 10.4.11 using a full retail disc? I am perfectly willing to wipe the entire machine - there is nothing essential on it.
2. If that is possible, would I then need to find a full retail copy of OS 9 for Classic mode to run, or is this built-in/included in the full version of 10.4?
3. If none of the above are possible (or practical), are there legitimate, stable emulators(?) out there that I can download/purchase to run old applications that require OS 9 on the G4 and/or a more modern Intel-based iMac? If so, could you recommend some?
Thanks so much for reading all that - I look forward to your responses!

Just erase the HD & install Tiger using the retail installer. After you install the base 10.4.x, update to the final Tiger version 10.4.11. Here's the link for the 10.4.11 combo update http://support.apple.com/kb/TA24901?viewlocale=en_US
If you just want to run classic mode while booted in Tiger, just copy the System Folder containing OS 9.2.1 or 9.2.1 from another Mac & transfer to your iMac. OS 9 is not included on the Tiger installer.
 Cheers, Tom

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