You can mask this in Safari and Chrome using the -webkit-mask
CSS3 property like so (see fiddle in Safari/Chrome):
<img src="http://i.stack.imgur.com/oJUzS.jpg"
style="-webkit-mask:url('http://i.stack.imgur.com/4KEpA.png')" />
However, to do a cross-browser implementation your mask will need alpha transparency in the black section of your .png image and then overlay the mask using CSS position.
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