I have lost my imac bootable disks and have erased my hard drive.

I wanted to format my hard drive and put a clean install of Tiger on my iMac so that I could sell it, so I went in to disc utility and erased my hard drive. What I thought were my bootable discs were for my macbook pro with Snow Leopard on, and they wont work on my iMac. I have since gone in to disc utilities from the bootable discs (just after it tells me these discs wont work) and have replaced my hard drive with the DVD (thinking I would be able to boot to that point and mount an image from another DVD to run tiger from there) and now I am totally lost! I know I shouldnt meddle with things I dont know, but I've never managed to break a windows PC by doing this!
Could someone help please as I have no idea what I can do now!
Super thanks
Helen

Replacement disks run about 16.00 per disk. You can buy Mac OS X Tiger from Amazon for anywhere from 79.00-200.00.
If you buy a full retail copy of an OS like Snow Leopard you can install that on any compatible computer. The license for a standard retail copy of the Mac OS entitles you to install it on 1 system. However the retail copy of the Mac OS does not include the iLife Applications which come with the original install disks that came with your computer.
The individual install disks that come with each computer are made just for that computer and include drivers required for that system. As a former Dell owner I can tell you that Dell also uses specialized install disks for the OS. They don't hand you a copy of windows, rather a set of disks that are specific to that model of computer.
Cheers!

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I have lost my imac bootable disks and have erased my hard drive.

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