Привет всем!

Такая проблема, как по нажатию кнопки сделать построение маршрута от метро Берестейка к определенному адресу (адрес известен).

<button class="route btn btn-primary" id="travelMode1" data-travelmode="WALKING">Пешком</button>
<button class="route btn btn-primary" id="travelMode2" data-travelmode="DRIVING">На авто</button>

function initialize() {
    
    var settings = {
        zoom: 17,
        center: new google.maps.LatLng(50.445068, 30.420486),
        mapTypeControl: true,
        mapTypeControlOptions: {
            style: google.maps.MapTypeControlStyle.DROPDOWN_MENU
        },
        navigationControl: true,
        navigationControlOptions: {
            style: google.maps.NavigationControlStyle.SMALL
        },
        mapTypeId: google.maps.MapTypeId.ROADMAP
    };
    var map = new google.maps.Map(document.getElementById("map_canvas"), settings);
//---------------------------------------------------
    var travelMode;
   // var travelMode = "google.maps.DirectionsTravelMode.WALKING";
 
    var modeButton1 = document.getElementById('travelMode1');
    var modeButton2 = document.getElementById('travelMode2');
 
    modeButton1.onclick = function() {
        travelMode = "google.maps.DirectionsTravelMode."+this.getAttribute('data-travelmode');
        modeButton2.className = '';
        this.className = 'active';
        setRoutetype ();
    }
 
    modeButton2.onclick = function() {
        travelMode = "google.maps.DirectionsTravelMode."+this.getAttribute('data-travelmode');
        modeButton1.className = '';
        this.className = 'active';
        setRoutetype ();
    }
 
 
//--------------------------------------------
    var balloon = new google.maps.InfoWindow();
    var service = new google.maps.DirectionsService();
    var direction = new google.maps.DirectionsRenderer({map: map});
    var position = new google.maps.LatLng(50.448238, 30.491260);
    var request = {
    origin:      position,
    destination: latlng,
    travelMode:  travelMode
  };
 
    var companyImage = new google.maps.MarkerImage('design/images/contacts/pin-jaya.png',
        new google.maps.Size(154, 133),
        new google.maps.Point(0, 0),
        new google.maps.Point(60, 120)
    );
 
    var companyPos = new google.maps.LatLng(50.448238, 30.491260);
 
    var companyMarker = new google.maps.Marker({
        position: companyPos,
        map: map,
        icon: companyImage,
        title: "JayaDigital",
        zIndex: 3
    });
 
        function setRoutetype () { 
        navigator.geolocation.getCurrentPosition(function(position) {
        showRouteService(position);
      });
     
    }
    function showRouteService(position) {
 
        var request = {
        origin:      new google.maps.LatLng(position.coords.latitude, position.coords.longitude),
        destination: latlng,
        travelMode: google.maps.DirectionsTravelMode.DRIVING
        };
 
      service.route(request, function(response, status) {
        if (status == google.maps.DirectionsStatus.OK) {
          direction.setDirections(response);
        }
      });
 
    }
 
}