function initialize() {
    var myOptions = {
      zoom: 16,
      center: new google.maps.LatLng(40.53, -3.89),
      mapTypeId: google.maps.MapTypeId.ROADMAP
    }
    var map = new google.maps.Map(document.getElementById("map_canvas"),
                                  myOptions);
 
    var image = 'http://www.grupohh.com/Graficos/LogoMapaDH.png';
    var myLatLng = new google.maps.LatLng(40.53241,-3.890727);
    var marker = new google.maps.Marker({
        position: myLatLng,
        map: map,
        icon: image,
        title: 'DobleHache'
    });
    var contentString = '<div id="content" style="font-family: Arial, Helvetica, sans-serif;">'+
        '<div id="siteNotice">'+
        '</div>'+
        '<h1 id="firstHeading">DobleHache</h1>'+
        '<div id="bodyContent">'+
        '<p>C/ Pollensa 4, 2&ordf; planta, Oficina 14 - 28290 Las Rozas, Madrid</p>' +
        '<p>Tel: 91 542 68 78</p>'+
        '</div>'+
        '</div>';
        
    var infowindow = new google.maps.InfoWindow({
        content: contentString
    });
 
    google.maps.event.addListener(marker, 'click', function() {
      infowindow.open(map,marker);
    });
  }