How do I show a local image for a GMarker? I am using v2. Code sample

```
var blueIcon = new GIcon(G_DEFAULT_ICON);
blueIcon.image = '/Images/marker/mr.png';
markerOptions = { icon: blueIcon };

map.setCenter(point, 3);
var marker = new GMarker(point, markerOptions);

```

Its not working...