show tooltip in polygon on mouseover

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Javascript

ASP.NET4

i have created multiple polygon on google map and i want show show tooltip on this polygon that show the polygon name dynamically from database


here is the code to show tooltip but not working ........

GEvent.addListener(poly, 'mouseover', function () {
    debugger;
    var infowindow = new GEvent.InfoWindow({
        content: 'Hello world'
    });
    infowindow.open(map);

});