drastic markers to google directions

Hi!

How can I add the drastic tools' markers overlay to this:


<script type="text/javascript">
var directionDisplay;
var directionsService = new google.maps.DirectionsService();
var map;
var origin = null;
var destination = null;
var waypoints = [];
var markers = [];
var directionsVisible = false;

function initialize() {
directionsDisplay = new google.maps.DirectionsRenderer();
var dunaujvaros = new google.maps.LatLng(46.963829, 18.9406);
var myOptions = {
zoom:7,
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: dunaujvaros
}
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
directionsDisplay.setMap(map);
directionsDisplay.setPanel(document.getElementById("directionsPanel"));

google.maps.event.addListener(map, 'click', function(event) {
if (origin == null) {
origin = event.latLng;
addMarker(origin);
} else if (destination == null) {
destination = event.latLng;
addMarker(destination);
} else {
if (waypoints.length < 9) {
waypoints.push({ location: destination, stopover: true });
destination = event.latLng;
addMarker(destination);
} else {
alert("Maximum number of waypoints reached");
}
}
});
}

function addMarker(latlng) {
markers.push(new google.maps.Marker({
position: latlng,
map: map,
icon: "http://maps.google.com/mapfiles/marker" + String.fromCharCode(markers.length + 65) + ".png"
}));
}

function calcRoute() {
if (origin == null) {
alert("Click on the map to add a start point");
return;
}

if (destination == null) {
alert("Click on the map to add an end point");
return;
}

var mode;
switch (document.getElementById("mode").value) {
case "bicycling":
mode = google.maps.DirectionsTravelMode.BICYCLING;
break;
case "driving":
mode = google.maps.DirectionsTravelMode.DRIVING;
break;
case "walking":
mode = google.maps.DirectionsTravelMode.WALKING;
break;
}

var request = {
origin: origin,
destination: destination,
waypoints: waypoints,
travelMode: mode,
optimizeWaypoints: document.getElementById('optimize').checked,
avoidHighways: document.getElementById('highways').checked,
avoidTolls: document.getElementById('tolls').checked
};

directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
}
});

clearMarkers();
directionsVisible = true;
}

function updateMode() {
if (directionsVisible) {
calcRoute();
}
}

function clearMarkers() {
for (var i = 0; i < markers.length; i++) {
markers[i].setMap(null);
}
}

function clearWaypoints() {
markers = [];
origin = null;
destination = null;
waypoints = [];
directionsVisible = false;
}

function reset() {
clearMarkers();
clearWaypoints();
directionsDisplay.setMap(null);
directionsDisplay.setPanel(null);
directionsDisplay = new google.maps.DirectionsRenderer();
directionsDisplay.setMap(map);
directionsDisplay.setPanel(document.getElementById("directionsPanel"));
}
</script>

Thank you very much!
Adam