title: change default icon of marker in route
body: <p>I want to change the default icon of marker when I search route between two locations. How can I do it? I use this code but I didn't get only the map without route and points</p>
  
  <pre><code>var start  = new google.maps.Marker({
  position: new google.maps.LatLng(lat, lon),
   icon:'http://www.google.com/mapfiles/dd-start.png',
   map: map  });
  
  var end = new google.maps.Marker({
  position: new google.maps.LatLng(lat1, long1),
  icon:'http://www.google.com/mapfiles/dd-end.png',
  map: map  });
  var request = {
              origin: start,
                  destination: end,
                  optimizeWaypoints: true,
              travelMode: google.maps.DirectionsTravelMode.DRIVING
              };
  </code></pre>