function load() {
  if (GBrowserIsCompatible()) {
    var map = new GMap2(document.getElementById("map"));
    map.setCenter(new GLatLng(51.5233, -0.1026), 13);

    //add zoom and type controls
    map.addControl(new GSmallMapControl());
    map.addControl(new GMapTypeControl());

    //add marker to the center
    var marker = new GMarker(map.getCenter())
    map.addOverlay(marker);	
  }
}