Add second marker on google maps javascript code - google-maps

Question

This is my code and i want to add a second marker on it. I'm not experienced on javascript and i couldn't figure out a way to do it. I'ld love some explain also!
<script type="text/javascript">
var map;
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(XX.XXXXX, YY.YYYYYY),
zoom: 15,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("map-canvas"),
mapOptions);
var myLatlng = new google.maps.LatLng(XX.XXXXX, YY.YYYYYY);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: "'. $xmladd .'"
});
}
google.maps.event.addDomListener(window, 'load', initialize);
google.maps.event.addDomListener(window, "resize", function () {
var center = map.getCenter();
google.maps.event.trigger(map, "resize");
map.setCenter(center);
});
</script>

Answer 1

Duplicate the code for the first marker, changing the position appropriately.
code snippet:
html,
body,
#map-canvas {
height: 100%;
width: 100%;
}
<div id="map-canvas"></div>
<script src="https://maps.googleapis.com/maps/api/js"></script>
<script>
var map;
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(40.7127837, -74.0059413),
zoom: 11,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("map-canvas"),
mapOptions);
var myLatlng = new google.maps.LatLng(40.7127837, -74.0059413);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: "'. $xmladd .'"
});
var myLatlng2 = new google.maps.LatLng(40.735657, -74.1723667);
var marker2 = new google.maps.Marker({
position: myLatlng2,
map: map,
title: "'. $xmladd2 .'"
});
}
google.maps.event.addDomListener(window, 'load', initialize);
google.maps.event.addDomListener(window, "resize", function() {
var center = map.getCenter();
google.maps.event.trigger(map, "resize");
map.setCenter(center);
});
</script>