function initialize() {
  var latlong = new google.maps.LatLng(51.23408, -0.32744);
  var myOptions = {
    zoom: 16,
    center: latlong,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };
 
  var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
 
  var marker = new google.maps.Marker({
      position: latlong,
      map: map,
      title:"White Horse Hotel"
  });
 
  var contentString = '<h3>Hunt Scott Chartered Surveyors Ltd.</h3>' +
                              '<p>296 High Street,<br />' +
                                    'Dorking,<br />' +
                                    'Surrey,<br />' +
                                    'RH4 1DZ<br /><br />';
 
  var infowindow = new google.maps.InfoWindow({
    content: contentString
  });
 
  google.maps.event.addListener(marker, 'click', function() {
    infowindow.open(map,marker);
  });
}
 
function loadScript() {
  var script = document.createElement("script");
  script.type = "text/javascript";
  script.src = "http://maps.googleapis.com/maps/api/js?sensor=false&callback=initialize";
  document.body.appendChild(script);
}
 
window.onload = loadScript;;