Creating markers with info windows using Google Maps Javascript API v3

var locations = new Array(),
    info = new Array(),
    content = new Array(),
    curr_infw; // We create a variable where we can store the most recently opened info window
 
// Loop through an array to add the data to our arrays
//   locations.push(new google.maps.LatLng(item.geo.coordinates[0],item.geo.coordinates[1]));
//   title.push(item.title);
//   content.push(item.content);
 
function initialize() {
  var latlng = new google.maps.LatLng(55.033983,-4.01001);
  var myOptions = {
    zoom: 6,
    center: latlng,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };
  var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
  for(i=0;i<locations.length;i++) {
    markers[i] = createMarker(locations[i], tweet_info[i], tweet_content[i], map);
  }
}
 
function createMarker(point, title, content, map) {
  var marker = new google.maps.Marker({
    position: point,
    map: map,
    title: title
  });
  var infowindow = new google.maps.InfoWindow({
    content: content
  });
  google.maps.event.addListener(marker, 'click', function() {
    if(curr_infw) { curr_infw.close();} // We check to see if there is an info window stored in curr_infw, if there is, we use .close() to hide the window
    curr_infw = infowindow; // Now we put our new info window in to the curr_infw variable
    infowindow.open(map, marker); // Now we open the window
  });
  return marker;
};