Trying to Instal Snow Leopard partition on Lion

Hi Everyone
I just recieved my new IMac and I need to instal Snow Leopard on one of the partitions.  Unfortunately everything I have tried has failed.  I desperately need 10.6.6 running on my machine.  Any help would be great!  Thanks!

Yes, I created a separate partition for this purpose.  I've tried to instal Leopard and failed.  Then Snow Leopard and failed again.  I thought all I had to do was press "C" on the keyboard at start up and it would boot off of the instal DVD.  All it ended up doing was beeping.
Any help or ideas would be great.  Thanks!

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