function initialize() {

    var map = new GMap2(document.getElementById("map"));
    map.addControl(new GLargeMapControl());
    map.addControl(new GMapTypeControl());
    map.setCenter(new GLatLng(-43.434971553373465, 172.64624118804932), 15);

    // add a marker
    var point = new GLatLng(-43.434971553373465, 172.64624118804932);
    var marker = new GMarker(point);

    GEvent.addListener(marker, "click", function() {
    var HtmlString = "<p><strong>Ravensteed Equestrian Centre</strong></p><p style='text-align: center;'><img src='./Images/RavensteedLogo.jpg' alt='Ravensteed' /></p>"
    map.openInfoWindowHtml(map.getCenter(), HtmlString);
    });
    
    map.addOverlay(marker);
}