My mac has only a windows partition that is not working!!! please help!

Ok this is the story.
While trying to installing windows on a partition of my mac book air I have installed a software that allows mac book air to see a bootable usb like a dvd. It worked perfectly than I pressed the wrong button while installing windows on my windows partition and CREATE EMPTY SPACE where there used to be my mac os lion.
Now when I switch it on what I see is only my windws partition which is not working.
I have no clue on what to do plaese please help!
Thank you

http://support.apple.com/kb/HT4718

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