How to format MacBook Pro 13" hard drive?

Basically what I want to do is format and erase every bit of data on my MacBook Pro 13" (late 2009) since I have too much junk and duplicates of many items and re-install Mac OS X. I already have backed up the most important items, so is there a way to completely refresh to factory settings with my Leopard install disc? I've tried just putting the disc in and launching from desktop, but it only re-installs OS X without fomatting.

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Tags: 13, hard drive, Mac, MacBook, MacBook Pro 13, OS X