How can I erase everything on my computer before I sell it?

I'm selling my Macbook Pro to the person who tried to fix it when my airport card stopped working but before I lose ownership of it I need to delete everything off of it! Problem is I can't find the box it came in along with the Installation Disk thats inside the box. Could someone please tell me how to delete everything from my computer?

Since the install DVDs are part of the Mac, you really should call AppleCare and ask them to send you a replacement set. They will charge you a nominal fee for shipping and handling.
Allan

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