google.load("maps", "2.x");

// Call this function when the page has been loaded
function initialize() {
    var googMap = new GMap2(document.getElementById("od_map"));
    var googLatlng = new google.maps.LatLng(52.132382,4.634321);
    var googBalloonLatlng = new google.maps.LatLng(52.132085,4.631038);
    googMap.addControl(new GSmallMapControl());
    googMap.setCenter(googLatlng, 14);
    googMap.openInfoWindow(googBalloonLatlng, document.getElementById("hiddenContactData"), {noCloseOnClick: true});

}

google.setOnLoadCallback(initialize);