Add more results in google map dynamically - php

Question

I am working on this from several hours but no success.
This code is working fine one time and add 100 records on map. Then I want to add more results from db after first 100. how can I do that please guide me. Here is the code.
I also try with ajax but json damage after result came back from php so that is also not work for me.
<div class="span12 geoData">
<?php
$db = new db();
$data = array();
$tweets = array();
$counter = 0;
$query = "SELECT * FROM `tweets` WHERE `geo_lat` != 0 LIMIT 100";
$results = $db->select($query);
$count = mysqli_num_rows($results);
while (($row = mysqli_fetch_assoc($results)) !=FALSE) {
$tweets[$counter]['tweet_text'] = $row['tweet_text'];
$tweets[$counter]['geo_lat'] = $row['geo_lat'];
$tweets[$counter]['geo_long'] = $row['geo_long'];
$counter++;
}
$data['count'] = $count;
$data['tweets'] = $tweets;
$jsonData = json_encode($data);
?>
<script src="mapsApi.js"></script>
<script src="markerclusterer_compiled.js"></script>
<script type="text/javascript">
var data = <?php echo $jsonData; ?>;
function initialize() {
var center = new google.maps.LatLng(39.744408452010475, -100.15602825000002);
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: center,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
infowindow = new google.maps.InfoWindow({
content: "holding..."
});
var markers = [];
for (var i = 0; i < data.count; i++) {
var contentSTR = '<div id="info"><p><span>Ttitle:</span> '+ data.tweets[i].tweet_text + '</p></div>';
var dataTweets = data.tweets[i];
var latLng = new google.maps.LatLng(dataTweets.geo_lat,
dataTweets.geo_long);
var marker = new google.maps.Marker({
position: latLng,
html: contentSTR,
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.setContent(this.html);
infowindow.open(map, this);
});
markers.push(marker);
}
var markerCluster = new MarkerClusterer(map, markers);
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
<div id="map-container">
<div id="map"></div>
</div>
</div>