I have OS X 10.5 but want to get 10.8. How to do it?

Please explain to me how to upgrade my Mac.

The first step in Upgrading... is to Snow Leopard = OS X 10.6.x
It is Not available as a download...
Do this first...
Check that your Mac meets the System Requirements for Snow Leopard...
Snow Leopard Tech Specs
http://support.apple.com/kb/SP575
If so Contact Apple in your Country to Purchase a Snow Leopard Disc...
http://support.apple.com/kb/HE57
In the US...
1-800-MY-APPLE or 1-800-676-2775
After the Successful Install, run Software Update to get the latest updates for Snow Leopard.
Be sure to make a Backup of your Current System Before Upgrading...

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