Reinstall OSX and Reformat Hard Drive

I have an older MacBook Pro that I am trying to clean up and sell. I cannot find the original CDs that came with the computer that have the OSX install and applications on them. What I do have is a Snow Leopard install DVD but I cannot figure out how to reformat the hard drive with Snow Leopard. I'm only figuring out how to do an upgrade install which does not refomrat the hard drive.
Will it be possible for me to do reformat the drive without those original CDs? What if I upgrade to Mavericks?
Thanks!

Thanks for help. I'm looking at the Disk Utility option now after putting the Snow Leopard disk in. I'm a bit confused... If I choose erase disk, wouldn't that totally wipe the hard drive and the current OSX on the machine and NOT install a new version? Would I then need to boot from the OSX disk after erasing the hard drive to install Leopard?

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