HT1338 My Hard drive was wiped how to restore operating system

My hard drive was accidentally wiped and there is no backup of my data.  How can I reinstall the operating system on my MacBook Air

1. If you have a Mac OS X install DVD or the computer originally shipped with a thumbdrive, insert or connect it.
2. Start up the computer with the Option key held down.
3. Click on the DVD, thumbdrive, or recovery partition.
4. Install an OS.
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    Message was edited by: Demo

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