Google Maps et Safari

// -----------------------------------------------
//    Module de géolocalisation
//------------------------------------------------
var directionDisplay;
var directionsService = new google.maps.DirectionsService();
var geocodeur = new google.maps.Geocoder();
var map;
var myLatlng;
var haight;

function afficher() {
        directionsDisplay = new google.maps.DirectionsRenderer();
          var myOptions = {
            zoom: 12,
            center: haight,
            mapTypeId: google.maps.MapTypeId.ROADMAP
            }
        map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
        directionsDisplay.setMap(map);
        var marker = new google.maps.Marker({
            position: haight,
            map: map,
            title:"Salle de Danse"
            });
}

function initialize() {

    haight = new google.maps.LatLng(document.getElementById( 'latitude' ).value,document.getElementById( 'longitude' ).value);
    Nom = navigator.appName;
    Safari= (Nom == 'Netscape') ? 1:0;
    Opera = (Nom == 'Opera') ? 1:0;
    ie = (Nom == 'Microsoft Internet Explorer') ? 1:0;

    if (!ie && !Opera)
    {
    if (navigator.geolocation ) {
        navigator.geolocation.getCurrentPosition(
        function(position)
        {
            myLatlng = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);
        },
        function (msg) { alert( "Localisation impossible", {maximumAge:Infinity, timeout:0} ); }
        );
        }
            document.getElementById( 'demande' ).style.display = 'none';
            document.getElementById( 'auto' ).style.display = '';
            afficher();
      }
        else
      {
            document.getElementById( 'demande' ).style.display = '';
            document.getElementById( 'auto' ).style.display = 'none';
            afficher();
      }
 }
 function rechercher() {

       var vous=document.getElementById( "vous" );
       adresse=vous.value;
       if (geocodeur) {
            // effectuer une requete de geocodage
            geocodeur.geocode({'address': adresse}, function(resultats, status) {
            myLatlng = resultats[0].geometry.location;

            if (status == google.maps.GeocoderStatus.OK) { //requete reussie
                calcRoute();
                } else { //il y'a eu un problem lors de la requete
                    alert("Une erreur s'est produite : " + status);
                }
            });
        }

    }
function calcRoute() {

        if (Safari) {
//           alert('1 '+myLatlng);
            }

        var selectedMode = "DRIVING";
        var request = {
            origin:      myLatlng,
            destination: haight,
            travelMode: google.maps.DirectionsTravelMode[selectedMode],
            unitSystem: google.maps.DirectionsUnitSystem.METRIC
            };
        directionsService.route(request, function(response, status) {
            if (status == google.maps.DirectionsStatus.OK) {
                directionsDisplay.setDirections(response);
            }
            });
}