> And how do i do this?

Map click events documented here
http://code.google.com/apis/maps/documentation/reference.html#GMap2.click
Map click returns a GLatLng object.

You can convert that into pixel using the provided utility methods
like
http://code.google.com/apis/maps/documentation/reference.html#GMap2.fromLatLngToDivPixel

You know your screen overlay pixel coordinates because you placed it
there.
You just need to test if click lies within those bounds, simple
greater than / less than maths.

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