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Upgrading from Tiger to Leopard

The curse of Ipad is now upon me. My Tiger would not respond to Ipad and I have to upgrade to Leopard(or any 10.5 OSX). I now have two sets of Leopard discs : a DVD double sided which is rejected by my iMac G5 and two cds . But no instruction how to use them to upgrade. It looks as if I have to use a bootable external memory disc or HD to