Wiping hardraive and reinstalling osx from disk

So.. I know there's a few of these threads around, but I can't find one that answers my problem directly...
I've tried to wipe my harddisk and reinstal my os (snow leopard) from the install disk that i got with my macbook pro when i bought it. I manually backed up, started up holnd cmd-R and wiped the harddisk from disk utility. Then tried to run the instal software and when you get to the select a disk to install on screen, i have only one option (my single inbuilt harddrive), however it says that i can't select that hardrive, doesn't offer an explantion why.. Any ideas?
One thought i had was that it might be due to the fact maveric is still on that drive? It's not installed but i can still install from it if i want and i can see it in disk utility, though i don't seem to be able to anything to it there. Do i need to delete it some how before snow leopard will install? If so, how? Obviously i need to be fairly sure that'll work or else i'll end up with no os at all...
Thanks in advance, let me know if i've left out any crutial info..
Sam

http://www.macworld.com/2001/10/bc/howtoimac/
is an article describing the process. It's not that hard, IMHO. If you've never done it before, plan on maybe an hour. A magnetic tipped phillips screwdriver will be the most important tool, as the little buggers can easily fall into the case if you're not careful. And there will be a fairly disconcerting crack when you open the iMac. Just make sure to follow the directions for a slot-loading iMac if that's what you have, the tray loading directions are listed first.
Jeff

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Wiping hardraive and reinstalling osx from disk

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