Adding markers to a google map with a loop

markers.js

google.maps.event.addListener(marker, 'click', 
   (function(marker_inner) {
      return function() {
        new google.maps.InfoWindow({
            content: 'Marker : ' + marker_inner.data.title
        }).open(map,marker_inner);
        map.setCenter(marker_inner.getPosition());
      }
   })(marker)
 );