Heat map with google maps - javascript

I need to create a heat map with google maps as like in the image,
I got some details from
https://support.google.com/fusiontables/answer/1032332?hl=en
But i don't know how to implement it with a website.Is there a js api for this?
Please help to create a heat map for some specific location with custom data.

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Duplicate: Google Maps API V3: limit map bounds
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PS. the copy of richmarker.js from here worked better for me

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