I don't see the airplay on my mac

I just purchased mountain lion, and the airplay does not appear in the top

Airplay and Airplay mirroring are not the same.  Airplay will work on your pre 2011 Mac.  Airplay mirroring, on the other hand, requires in-GPU H264 encoding which according to apple is only available on the 2011 Macs.
Airparrot works by doing the H264 encoding via your CPU.  It is not the most ideal method (heating, fans kick in, etc) which is why apple decided to draw the line at 2011.

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