infowindow open trigger

  // The function to trigger the marker click, 'id' is the reference index to the 'markers' array.
  function markerClick(id){
    google.maps.event.trigger(markers[id], 'click');
  }
  
  // this should be on the loop creating the markers
  google.maps.event.addListener(marker, 'click', (function(marker, i) {
        return function() {
          infowindow.open(map, marker);
        }
      })(marker, i));