Deleting Hard Drive for sale of computer

Hi Everyone....
I have a old iMac G3 Desktop computer which I want to sell.......
It has on it 10.4 (not sure which version as I haven't fired it up in a while.....)
I would like to erase the hard drive (of all applications, music, photos etc) and leave the basic OS X and I was just wondering what is the easiest way to do it......
I know I can go through and delete all of the added application folders, music and photos etc but that will probably leave a lot of excess folders I assume.....
Can I manually delete all of these folders and then use the Disk Utility to clear out the rest and leave just the basic operating system and programs?? (and how do I do that?)
Or is it easier to re-install 10.4 and use the option (from memory) of erasing the target disc when it installs it??
any advice would be appreciated.....
Thanks

Hello Craig
In addition to roam's excellent advice, I recommend that you securely erase your drive before installing a fresh copy of the OS on it. Particularly if you ever stored any sensitive information on your computer. This writes over the drive several times with random patterns to ensure that nobody can read the data that used to be on there.
If you just do a simple erase, only the pointers to the files are removed. The actual data in the files is left on the disk and anyone who wanted to could recover them. It's generally regarded as good practice nowadays to securely erase hard drives before selling them on. It is a worthwhile precaution even if you don't think that there is much on there worth retrieving.
For more information see the bottom of this page: http://docs.info.apple.com/article.html?artnum=301270 and also here: http://docs.info.apple.com/article.html?path=DiskUtility/10.5/en/duh1011.html.
Be aware, securely erasing a disk takes a long time.

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