Gmaps break

function initialize() {

var styles =   [
  {
    stylers: [
      { hue: '#F2846A' },
      { saturation: 80 }
    ]
  },{
    featureType: 'road',
    elementType: 'geometry',
    stylers: [
      { lightness: 100 },
      { visibility: 'simplified' }
    ]
  },{
    featureType: 'road',
    elementType: 'labels',
    stylers: [
      { visibility: 'off' }
    ]
  }
];

var mapOptions = {
  zoom: 12,
  center: new google.maps.LatLng(52.204872,0.120163),
  mapTypeId: google.maps.MapTypeId.ROADMAP,
  styles: styles,
  scrollwheel: false
};
var map = new google.maps.Map(document.getElementById('map_canvas'),mapOptions);

setMarkers(map, sites);
    infowindow = new google.maps.InfoWindow({
    content: "loading..."
});
}

var sites = [
    ['The Frontroom', 52.202977,0.138938, 1, '<p>The Frontroom. <br/>23-25 Gwydir Street, Cambridge, CB1 2LG <br/>01223 305 600</p>'],
    ['Fitzwilliam Museum',52.199678,0.119931, 2, 'Fitzwilliam Museum'],
    ['Wysing Arts centre', 52.182077,-0.06977, 3, 'Wysing Arts Centre'],
    ['Cambridge School of Art', 52.203825,0.134808, 4, 'Cambridge School of Art'],
    ['Kettles yard', 52.210851,0.114637, 5, 'Kettles Yard'],
    ['Changing Spaces',52.199678,0.119931, 6, 'Changing Spaces'],
    ['Aid & Abet', 52.195218,0.136578, 7, 'Aid & Abet'],
    ['The Junction', 52.190756,0.136522, 8, 'The Junction']
];

function setMarkers(map, markers) {

for (var i = 0; i < markers.length; i++) {
    var sites = markers[i];
    var siteLatLng = new google.maps.LatLng(sites[1], sites[2]);
    var marker = new google.maps.Marker({
        position: siteLatLng,
        map: map,
        title: sites[0],
        zIndex: sites[3],
        html: sites[4],
        icon: "http://visualartscambridge.org/wp-content/uploads/2013/03/map-pin.png"
    });
    // Begin example code to get custom infobox
    var boxText = document.createElement("div");
    boxText.style.cssText = "border: 1px solid black; margin-top: 8px; background: yellow; padding: 5px;";
    boxText.innerHTML = marker.html;

    var myOptions = {
         content: boxText
        ,disableAutoPan: false
        ,maxWidth: 0
        ,pixelOffset: new google.maps.Size(-140, 0)
        ,zIndex: null
        ,boxStyle: {
          background: "url('http://google-maps-utility-library-v3.googlecode.com/svn/tags/infobox/1.1.12/examples/tipbox.gif') no-repeat"
          ,opacity: 0.75
          ,width: "280px"
         }
        ,closeBoxMargin: "10px 2px 2px 2px"
        ,closeBoxURL: "http://www.google.com/intl/en_us/mapfiles/close.gif"
        ,infoBoxClearance: new google.maps.Size(1, 1)
        ,isHidden: false
        ,pane: "floatPane"
        ,enableEventPropagation: false
    };
    // end example code for custom infobox
    var ib = new InfoBox(myOptions);

    google.maps.event.addListener(marker, "click", function (e) {
     // Added this extra line to call in content but now styles on infobox don't work????
     ib.setContent(this.html);
     ib.open(map, this);
    });

}
}

google.maps.event.addDomListener(window, 'load', initialize);