function load () {
    var map = document.getElementById("map_canvas");
    if (GBrowserIsCompatible()) {
        var gmap = new GMap2(map);
        gmap.addControl( new GSmallMapControl() );
        gmap.addControl( new GMapTypeControl()) ;
        gmap.addControl( new GOverviewMapControl(new GSize(100,100)) );
        gmap.setCenter(new GLatLng(51.288699, -1.978186), 14);
        var point = new GLatLng(51.293858, -1.980541);
        gmap.addOverlay(new GMarker(point));
    }
}
window.onload = load;
window.onunload = GUnload;