How can I restore to factory settings and wipe harddrive?

I am selling my macbookpro 2.16GHz 120GB Duo Core online and I want to be sure that any information cannot be reclaimed from the hard drive. So far I have transfered my files to an external HD and erased all files on the laptop through the trash can application, including emptying the trash. I then inserted the original install disk which I believe returned the computer to factory settings because once it is turned on it begins with the welcome/ set up screens. But I really just want to be sure that I have erased everything and that nothing can be rebuilt from the hard drive. Should I have done something else to "deep clean" it?

Boot from your OS installer disk. The one that came with the MBP. Select Disk Utility from the Utilities menu. Select the hard drive and then select Erase. You have several choices for the erase procedure so select the one you prefer. The more passes you select the longer the procedure will take. Then install the OS. After the last reboot when Mac Setup Assistant begins to run quit it and direct the Mac to shut down. The next time it's booted (by your new buyer) it will run again and they will have the opportunity to set it up from brand new.

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