Create three circle mask with canvas

I need to create a circle mask with canvas, I’m trying to do that, but I can’t get it.

I knew to do that with Flash, but I prefef to do without that technology: http://i.stack.imgur.com/jJBN5.gif

May anybody help me with this? I don’t know too much about javascript

What I need is create three circles with different sizes on a picture (Canvas with background color).

I know that you are not here to do the job of others but however much I tried I hace not gotten…


Source: html5

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