////////////////////////////////      Baseado em :     ///////////////////////////////////////////
//                                                                                              //
// http://code.google.com/apis/maps/documentation/javascript/tutorial.html#Loading_the_Maps_API //
//                                                                                              //
//////////////////////////////////////////////////////////////////////////////////////////////////

  function CoordMapType(tileSize) {
    this.tileSize = tileSize;
  }
 
  var map;
  var chicago = new google.maps.LatLng(41.850033,-87.6500523);
  
  function initialize() {
    var mapOptions = {
      zoom: 10,
      center: chicago,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    };
    map = new google.maps.Map(document.getElementById("map_canvas"),
                                      mapOptions);

    // Insert this overlay map type as the first overlay map type at
    // position 0. Note that all overlay map types appear on top of
    // their parent base map.
    map.overlayMapTypes.insertAt(
        0, new CoordMapType(new google.maps.Size(256, 256)));
  }