How to delete all files on old mac?

Just got a new Mac Dual Core Intel Xeon for my main work computer. Transferred files from old G5 Tower to this new computer. NOW, I need to erase all files on the old G5 so new user can start from scratch (reinstall software, delete all of my old files, etc.)
What is the best way to do this so that all is erased properly and no settings carry over from my user account?
THANKS in advance!

This is how you can erase the HD inside your iMac
-Insert the installation disc 1 and sthut down your Mac
-Start your Mac again while holding down the C key
-Now your Mac should boot from the CD, this can take some time.
-After a while you will see a installation screen where you can chose a language.
-Chose English and continue.
-Then click some time's next and agree with the "Software Agreement".
-Open Disk Utility. Top menu bar --> Utilities --> Open Disk Utility.
-Select your hard disk in the list of disks and volumes on the left side
-Go to the erase tab on the right side
-Select "Mac OS Extended (Journaled)"
-Type "Macintosh HD"
-Click to the options button
-Select the option "Zero Out Data"
-Press OK
-Press the erase button
-Wait until Disk Utility is ready and close it
Now you can extit the installer or continue to install a clean OSX.
Hopefully this is helpfull or solved your problem. Consider rewarding some points!
Please see the "helpfull" and "solved" button's on top off this message! Apple: Why reward points?

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