Solution to generating markers along a route at a regular interval

I found this neat javascript extension for the google map api. Here is the link:

http://econym.org.uk/gmap/epoly.htm

You specify the distance and give it a polyline and it returns an array of points along the route.

map.setCenter(new GLatLng(42.351505,-71.094455), 15);
    var directionsPanel = document.getElementById("directions_div");
    var directions = new GDirections(map, directionsPanel);
    var address = "from: trenton, nj to: philadelphia, pa";

    directions.load(new_address);
  if (directions == null){
    alert("Error: directions object is null");
    return;
   }
   
   var pl = directions.getPolyline();
   
   if (pl == null){
    alert("Error: polyline object is null");
    return;
   }
   
   var points = pl.GetPointsAtDistance(1609.344);

   if (points == null){
    return;     
   }
   
   for (var i=0; i
    map.addOverlay(new GMarker(points[i]));
   }