function loadGMap() {
  if (GBrowserIsCompatible()) {
    var map = new GMap2(document.getElementById("map"));
    map.setCenter(new GLatLng(51.509837474705314, -0.14803082328381859), 15);
    map.addControl(new GSmallMapControl());

    var icon = new GIcon();
    icon.image = "/images/gmap/asf_icon.png";
    icon.iconSize = new GSize(40, 70);
    icon.iconAnchor = new GPoint(20, 70);
    icon.shadow = "/images/gmap/asf_icon_shadow.png";
    icon.shadowSize = new GSize(80, 70);
    icon.infoWindowAnchor = new GPoint(40, 1);

    var point = new GLatLng(51.509837474705314, -0.14803082328381859);
    var marker = new GMarker(point, icon);
    map.addOverlay(marker);
    function openInfoWindow() {
      marker.openInfoWindowHtml('<div style="width:200px;text-align:left;"><b>The Asset Factor</b><br />11-15 Farm Street<br />London W1J 5RS</div>');
    }
    GEvent.addListener(marker, "click", openInfoWindow);
  }
}
window.onload = loadGMap;
window.onunload = GUnload;