Google Maps JavaScript API v3
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KML Layers

View this example full screen.

JavaScript
function initialize() {
  var chicago = new google.maps.LatLng(41.875696,-87.624207);
  var mapOptions = {
    zoom: 11,
    center: chicago,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  }

  var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

  var ctaLayer = new google.maps.KmlLayer({
    url: 'http://gmaps-samples.googlecode.com/svn/trunk/ggeoxml/cta.kml'
  });
  ctaLayer.setMap(map);
}

google.maps.event.addDomListener(window, 'load', initialize);
JavaScript + HTML
<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>KML Layers</title>
    <link href="/maps/documentation/javascript/examples/default.css" rel="stylesheet">
    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
    <script>
function initialize() {
  var chicago = new google.maps.LatLng(41.875696,-87.624207);
  var mapOptions = {
    zoom: 11,
    center: chicago,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  }

  var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

  var ctaLayer = new google.maps.KmlLayer({
    url: 'http://gmaps-samples.googlecode.com/svn/trunk/ggeoxml/cta.kml'
  });
  ctaLayer.setMap(map);
}

google.maps.event.addDomListener(window, 'load', initialize);

    </script>
  </head>
  <body>
    <div id="map-canvas"></div>
  </body>
</html>

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