Circle in google map

[pippuccio76]

Salve ho un problema con il circle di google map , questo il codice :

  <script src="http://maps.googleapis.com/maps/api/js?v=3.exp&amp;sensor=false"></script>


                                          <script type="text/javascript">
                                        
       
                                              function init_map() {
                                                  var myOptions = {
                                                      zoom: 16,
                                                      center: new google.maps.LatLng(<?php echo $latitude; ?>, <?php echo $longitude; ?>),
                                                      mapTypeId: google.maps.MapTypeId.ROADMAP
                                                  };
                                                  map = new google.maps.Map(document.getElementById("gmap_canvas"), myOptions);
                                                  marker = new google.maps.Marker({
                                                      
                                                      position: new google.maps.LatLng(<?php echo $latitude; ?>, <?php echo $longitude; ?>)
                                                  });


                                                  // Add circle overlay and bind to marker
                                            var circle = new google.maps.Circle({
                                              map: map,
                                              radius: 160, 
                                              strokeColor: '#FF0000',
                                                  strokeOpacity: 0.8,
                                               strokeWeight: 2,
                                               fillColor: '#FF0000',
                                               fillOpacity: 0.05,


                                                 // 10 miles in metres
                                              // fillColor: '#AA0000'
                                            });
                                              circle.bindTo('center', marker, 'position');
                                                  infowindow = new google.maps.InfoWindow({
                                                      content: "<?php echo $formatted_address; ?>"
                                                  });
                                                  google.maps.event.addListener(marker, "click", function () {
                                                      infowindow.open(map, marker);
                                                  });
                                                  infowindow.open(map, marker);
                                              }
                                              google.maps.event.addDomListener(window, 'load', init_map);
                                          </script>
                                       
                                          <?php
                                       
                                          // if unable to geocode the address
                                          }else{
                                              echo "No map found.";
                                          }


                                  ?>

I dati sono inseriti correttamente in precedenza , però la mappa appare solo se premo il pulsnte ispeziona elemento di chrome o analizza elemento di firefox .

Quale potrebbe essere il motivo ?