Google Maps: Put Marker on Top Left of The Map

just like the title s开发者_开发知识库ay, I know how to add marker on specific lat,lon. Now I want to add marker and put it on top left or top right of the map. How to accomplish this using javascript api v3 ?

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http://code.google.com/apis/maps/documentation/javascript/reference.html#MapCanvasProjection

fromDivPixelToLatLng(pixel:Point)

Computes the geographical coordinates from pixel coordinates in the div that holds the draggable map.