var locations = [
  [ 51.062099,-4.012692, 'St Paul\'s Church'],
  [ 51.062359,-4.009501, 'Landkey Primary School'],
  [ 51.061984,-4.002969, 'Village_Hall'],
  [ 51.063795,-4.001446, 'Millennium Green'],
  ];
  
  
function initialize() {

    var myOptions = {
      center: new google.maps.LatLng(51.062423,-4.005615),
      zoom: 15,
      mapTypeId: google.maps.MapTypeId.ROADMAP

    };
    var map = new google.maps.Map(document.getElementById("googleMap"),
        myOptions);

    setMarkers(map,locations)

  }
  
 

function setMarkers(map,locations){	

      var marker, i

for (i = 0; i < locations.length; i++)
 {  

 var lat = locations[i][0]
 var long = locations[i][1]
 var text =  locations[i][2]

 latlngset = new google.maps.LatLng(lat, long);

  var marker = new google.maps.Marker({  
          map: map, position: latlngset  
        });
        

  var infowindow = new google.maps.InfoWindow()
  
  var content = '<div style="font-weight:bold;color:blue;display:block;">' + text + '</div>';

google.maps.event.addListener(marker,'mouseover', (function(marker,content,infowindow){ 
    return function() {
        infowindow.setContent(content);
        infowindow.open(map,marker);
    };
})(marker,content,infowindow)); 

 google.maps.event.addListener(marker,'mouseout', (function(marker,content,infowindow){ 
    return function() {
        infowindow.close(map,marker);
    };
})(marker,content,infowindow)); 

  }
  }

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