How to reinstall OS X on a windows Macbook Pro?

I have a Macbook Pro model A1286. An employee installed bootcamp and now only windows shows on startup. How do I get OS X back on the device? Only the windows partition shows on bootup with options pressed. Is there a way to download the OS through a windows PC? At work that is all we have.

Hi misplacedTXn,
I would suggest that you attempt to reinstall OS X on your computer using the instructions in the following article:
OS X Mountain Lion: Reinstall OS X
http://support.apple.com/kb/PH10763
If your recovery partition is not present, your computer will use the internet recovery to reinstall the Recovery partition and OS X:
OS X: About OS X Recovery
http://support.apple.com/kb/ht4718
OS X Internet Recovery
Mac models introduced after public availability of OS X Lion include the ability to start up directly from an Internet-based version of the OS X Recovery system. OS X automatically uses this feature when the Recovery System on the hard disk isn't available (such as when your hard disk encounters an issue, or when your hard disk has been replaced or erased). OS X Internet Recovery lets you start your Mac directly from Apple's servers. Starting up from this system performs a quick test of your memory and hard drive to check for hardware issues.
OS X Internet Recovery presents a limited interface at first, with only the ability to select your preferred Wi-Fi network and, if needed, entering a passphrase. Next, OS X Internet Recovery downloads and starts from a Recovery System image. From there, you are offered the same utilities and options as a local Recovery System.
Some computers that did not ship with OS X Lion or later installed may be able to add the ability to use Internet Recovery by applying a software update.
Thanks for coming to the Apple Support Communities!
Regards,
Braden

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