serve png tiles in Google Maps

var eightteensixtyOptions = {
  getTileUrl: function(coord, zoom) {
    return "/1860/tiles-1860/" + zoom +"/" + coord.x+"/"+coord.y+ ".png";
  },
  tileSize: new google.maps.Size(256, 256),
  isPng: true,
  maxZoom:14,
  minZoom:10,
  name:"What",
  
};
 
var eightteensixtyMapType = new google.maps.ImageMapType(eightteensixtyOptions);