How to erase old macbook HD without install disk

I have an old macbook that im looking to donate. Its running on os x 10.5.8
Id like to format my HD to delete all of the information on it.
I dont have the original install DVD.
Ive tried using Disk Utility. When i go to erase, the buttons are greyed out.
Please help!
Thanks

If both computers have Firewire ports, then connect them with a Firewire cable and useTarget Disk Mode to boot the old computer. Boot your computer normally. The disk drive of the old computer will appear on the Desktop of your computer. You can then use Disk Utility to erase the drive. You will want to do this:
Drive Partition and Format
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Apply button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
This will assure that nothing on the drive could ever be recovered. However, you will not have an operating system to install which is a problem. Ideally, you should purchase replacement discs for the computer and install the original system with which it came.
Apple Store Customer Service at 1-800-676-2775 or visit online Help for more information.
To contact product and tech support: Apple - Support - Contact Apple Support.

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