Marker Cluster Revision

/*!
 * IP Address geocoding API for Google Maps
 * http://lab.abhinayrathore.com/ipmapper/
 * Last Updated: June 13, 2012
 */
var IPMapper = {
    map: null,
    mapTypeId: google.maps.MapTypeId.ROADMAP,
    latlngbound: null,
    infowindow: null,
    baseUrl: "http://freegeoip.net/json/",
    initializeMap: function(mapId){
        IPMapper.latlngbound = new google.maps.LatLngBounds();
        var latlng = new google.maps.LatLng(0, 0);
        //set Map options
        var mapOptions = {
            zoom: 1,
            center: latlng,
            mapTypeId: IPMapper.mapTypeId
        }
        //init Map
        IPMapper.map = new google.maps.Map(document.getElementById(mapId), mapOptions);
        //init info window
        IPMapper.infowindow = new google.maps.InfoWindow();
        //info window close event
        google.maps.event.addListener(IPMapper.infowindow, 'closeclick', function() {
            IPMapper.map.fitBounds(IPMapper.latlngbound);
            IPMapper.map.panToBounds(IPMapper.latlngbound);
        });
    },
    addIPArray: function(ipArray){
        ipArray = IPMapper.uniqueArray(ipArray); //get unique array elements
        //add Map Marker for each IP
    var markerArray = [];
        for (var i = 0; i < ipArray.length; i++){
            IPMapper.addIPMarker(ipArray[i]);
        }
    var markerCluster = new MarkerClusterer(IPMapper.map, markerArray);
    },
    addIPMarker: function(ip){
        ipRegex = /^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$/;
        if($.trim(ip) != '' && ipRegex.test(ip)){ //validate IP Address format
            var url = encodeURI(IPMapper.baseUrl + ip + "?callback=?"); //geocoding url
            $.getJSON(url, function(data) { //get Geocoded JSONP data
                if($.trim(data.latitude) != '' && data.latitude != '0' && !isNaN(data.latitude)){ //Geocoding successfull
                    var latitude = data.latitude;
                    var longitude = data.longitude;
                    var contentString = "";
                    $.each(data, function(key, val) {
                        contentString += '<b>' + key.toUpperCase().replace("_", " ") + ':</b> ' + val + '<br />';
                    });
                    var latlng = new google.maps.LatLng(latitude, longitude);
                    var marker = new google.maps.Marker({ //create Map Marker
                        map: IPMapper.map,
                        draggable: false,
                        position: latlng
                    });
                    markerArray.push(marker); //place Marker on Map

                } else {
                    IPMapper.logError('IP Address geocoding failed!');
                    $.error('IP Address geocoding failed!');
                }
            });
        } else {
            IPMapper.logError('Invalid IP Address!');
            $.error('Invalid IP Address!');
        }
    },
    placeIPMarker: function(marker, latlng, contentString){ //place Marker on Map
        marker.setPosition(latlng);
        google.maps.event.addListener(marker, 'click', function() {
            IPMapper.getIPInfoWindowEvent(marker, contentString);
        });
        IPMapper.latlngbound.extend(latlng);
        IPMapper.map.setCenter(IPMapper.latlngbound.getCenter());
        IPMapper.map.fitBounds(IPMapper.latlngbound);
    },
    getIPInfoWindowEvent: function(marker, contentString){ //open Marker Info Window
        IPMapper.infowindow.close()
        IPMapper.infowindow.setContent(contentString);
        IPMapper.infowindow.open(IPMapper.map, marker);
    },
    uniqueArray: function(inputArray){ //return unique elements from Array
        var a = [];
        for(var i=0; i<inputArray.length; i++) {
            for(var j=i+1; j<inputArray.length; j++) {
                if (inputArray[i] === inputArray[j]) j = ++i;
            }
            a.push(inputArray[i]);
        }
        return a;
    },
    logError: function(error){
        if (typeof console == 'object') { console.error(error); }
    }
}