function initialize() {

    var mapOptions = {
        zoom: 11,
        center: new google.maps.LatLng(54.59673227, -5.92712402),
        mapTypeId: google.maps.MapTypeId.ROADMAP,
        scrollwheel: false
    };

    map = new google.maps.Map(document.getElementById('map_canvas'), mapOptions);

    var markers = [];
    
    
    var bounds = new google.maps.LatLngBounds();
    for (var i = 0; i < markers.length; i++) {
        bounds.extend(markers[i].getPosition());
    }
    map.fitBounds(bounds);
    
    google.maps.event.addListener(infoWindow, 'domready', function() {
        var iwOuter = $('.gm-style-iw');
        var iwBackground = iwOuter.prev();
        iwBackground.children(':nth-child(2)').css({'display' : 'none'});
        iwBackground.children(':nth-child(4)').css({'display' : 'none'});
        iwOuter.parent().parent().css({left: '10px'});
        iwBackground.children(':nth-child(1)').attr('style', function(i,s){ return s + 'left: 155px !important;'});
        iwBackground.children(':nth-child(3)').attr('style', function(i,s){ return s + 'left: 155px !important;'}); 
        iwBackground.children(':nth-child(3)').find('div').children().css({'box-shadow': '', 'z-index' : '1'});
        var iwCloseBtn = iwOuter.next();
        iwCloseBtn.css({'display': 'none'});
    });
 
    var clusterStyles = [
    {
    textColor: 'white',
    url: '/images/cluster-new.png',
    height: 50,
    width: 50
    }, 
    { 
    textColor: 'white',
    url: '/images/cluster-new2.png',
    height: 50,
    width: 50
    },
    {
    textColor: 'white',
    url: '/images/cluster-new.png',
    height: 50,
    width: 50
    }
    ];
    
    // Clusters options.
    var clusterOp = {
    gridSize: 50,
    styles: clusterStyles,
    maxZoom: 15
    };
    
    
    // Construct the Clusters.
    var markerCluster = new MarkerClusterer(map, markers, clusterOp);
    
}
//google.maps.event.addDomListener(window, 'load', initialize);