Installing snow leopard on a disc partioned imac running lion.

I've read of people installimg snow leopard on there macs running lion in a disc partitioned hard drive but my imac will not allow it.
It gives me an error message that it will not run on this mac and I need to install X 23.1.1.
Tried using the disc as start up but it just gives of a neverending series of 3 beeps. Anyone have a solution for this?

The disk is too old. Perform the installation on another computer, update it to 10.6.8, and move the system back. If that doesn't work, nothing will(besides running Mac OS X Server 10.5 or 10.6 in emulation.)
(64879)

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