Что делает эта функция javascript?

<?php
$address = $this->address;
?>
<script type="text/javascript">
var section = <?php echo $this->section->id; ?>;
var scale=10;
var c_lat = <?php echo $address[0]['geo_lat']; ?>;
var c_long = <?php echo $address[0]['geo_long']; ?>;
var clustereradded = 1;
ymaps.ready(function(){
map.init('map');
map.setCenter([c_lat, c_long], scale);
var step = 1;
showmap(step);

function showmap(step){
getadressdata(section,step);
timerID = setInterval(function(){
if (clustereradded != 1){
if(clustereradded == 2){
clustereradded = 1;
step++;
clearInterval(timerID);
showmap(step);
}else{
clustereradded = 0;
clearInterval(timerID);
}
}
}, 200);
}
});
</script>