How do you erase a macbook hard disk and reinstall OS X ?

I just upgraded to a MacBook Air.  Now I want my wife to be able to use my older MacBook (2009 model).  What is the best way to erase it completely and then put her TimeMachine backup from her (even older) MacBook (2006) on it? 
She is runnign OS X Snow Leopard.  I am running  OS X Lion on the 2009 MacBook. 
Thanks in advance!
LW

Drive Preparation and Reinstall
1. Boot from your Snow Leopard Installer Disc. After the installer loads select your language and click on the Continue button.  When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area.  If it does not say "Verified" then the drive is failing or has failed and will need replacing.  SMART info will not be reported  on external drives. Otherwise, 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 Partition 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.
Steps 4-6 are optional but should be used on a drive that has never been formatted before, if the format type is not Mac OS Extended, if the partition scheme has been changed, if there's a security concernt, or if a different operating system (not OS X) has been installed on the drive.
Upon completion quit DU and return to the installer. Install Snow Leopard. Once Snow Leopard has been installed you will be able to restore from a TM backup via the Setup Assistant.

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