Ibook g3 help

[slimm44]

I am selling a friends ibook G3 on ebay but before I list it, I want to reformat the hard drive so that it is 'like new' for whoever buys it. I'm not an apple/macintosh pc guy so I need some help figuring out how to do so. Any help would be great. Thanks a lot

 

Edit: Nevermind - found out we needed the CD. Sorry

 

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