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It appears you're looking for DNS Failover.
Check out http://www.dnsmadeeasy.com
You can do this yourself (if you have the servers available), but for a small fee, you can use the company listed above to handle it for you.
I have no association with the above URL. I have read many great reviews on them, however I have never used their service.
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I third this. It is a good way to make sure you have 100% uptime.