How do i securely wipe the disk on an iMac?

I replaced an old iMac and want to donate it to charity. But I need to securely wipe the disk first. Can someone please provide instructions. Thanks?

If your machine came with DVDs then you can do a reformat using Disk Utility on the install DVD that came with the machine, click Erase - Security and choose the number of passes, the more secure you go the longer it takes. If you have a large (1TB or more) and set it to the highest security the erase process could take days and no I am not kidding. In most case set it to a very moderate setting is just fine.
If your machine came with Lion or later where no DVDs were shipped, boot into the Recovery Partition and launch DU from there.

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