codice:
 <script>
      var map;
var pos;
      function initialize() {
        var mapOptions = {
          zoom: 6,
          mapTypeId: google.maps.MapTypeId.ROADMAP
        };
        map = new google.maps.Map(document.getElementById('map_canvas'),
            mapOptions);

        // Try HTML5 geolocation
        if(navigator.geolocation) {
          navigator.geolocation.getCurrentPosition(function(position) {
          pos   = new google.maps.LatLng(position.coords.latitude,
                                             position.coords.longitude);
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