How can I reinstall OS X without signing to App Store

I had Mountain Lion on my macbook pro and I wanted to reinstall it. So I formated the hard drive and tried to use "Reinstall OS X" from restore hd. I only forgot one thing, this version of system was bought by my friend and with his Apple ID. I had bought 10.6 I thing but there is no way to downgrade. How can I solve this? I don´t know anybody else with mac and I don´t have any contact on that friend. I don´t have Time Machine backup.
(Sorry for bad english.. it isn´t my mother tongue)
Thank you.

I only forgot one thing, this version of system was bought by my friend and with his Apple ID.
You can't reinstall Mountain Lion without knowing your friend's Apple ID and password. In other words, you had been using an illegal copy of ML. You need to purchase your own. It's only $20. Apple will not help you reinstall ML from another user's account.
Since you do own Snow Leopard, you have to do a two step reinstall to get back to Mountain Lion.
1) Insert the Snow Leopard DVD and boot to it by restarting and holding down the Option key. Once the screen to choose a startup disk appears, choose the DVD and install Snow Leopard onto the hard drive.
2) Once the install is complete, your Mac will be 10.6.3 at the newest since that was the last version released on disk. You must then download and install the 10.6.8 Combo Update to get the App Store installed.
3) Launch the App Store and login with your Apple ID and password, which is the same one you use to login to these forums. Purchase Mountain Lion. It will download and automatically launch the installation. With a legal copy under your Apple ID, you will always be able to get it again in the future without paying for it again.

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