How can i install mac os when i already erased my hard disk and no way to go back to my mac i'm in did erased by conrol key r then i can't do anything i have four choices restore back up,reinstall ,get help online here where i'm using the broswer and disk

when i tried to reinstall from that option and i entered my apple id it says that i need apple id that was used to purchase lion,
i have no cd for that when i bought it.i am using macbook pro.
i can's use my mac anymore i am using it by clicking on control and key R when i on then i use get help online to get help like now.
i have no back up too.
what can i do in this situaion .

Try CMD+R. That will restore the latest version you were running.

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