How do I uninstall Ubuntu from my MacBook and replace it back to mac?

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http://askubuntu.com – I recently switched my old 2006 I believe MacBook to Ubuntu because I wanted to try it out for a couple of things. I decided to reformat since I didn't have the space to dual-boot, but now when I want Snow Leopard back for my MacBook it doesn't let me install. It asks what disk I want to install to, but none show up. Any help? Thanks. (HowTos)