I am reinstalling OS X on a new hard drive but

I purchased mountain lion OS 10.8 from app store and had it installed on macbook pro. I had to get a new HD but the external HD I'm using to reinstall has Lion 10.7. How can I get a copy of mountain lion OS 10.8?

Open the Mac App Store, log in with the Apple ID used to buy it, click on the Purchases tab, and redownload it from there. This is free.
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