How i can add a title tooltip on marker from a xml file

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XML

Google-Maps

Can someone tell me how i can add a title on markers loaded from a Xml file.

This is the code;

<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript" src="downloadxml.js"></script>
<script type="text/javascript">
		
var infoWindow = new google.maps.InfoWindow();
	
function createMarker(point,info,map) {

	var myMarkerOpts = {
	position: point,
	map: map,
	icon: "ikon.png",
	shadow: "ikon_shadow.png",
	};
 
	var marker = new google.maps.Marker(myMarkerOpts);
 
	google.maps.event.addListener(marker, 'click', function() {
	infoWindow.close();
	infoWindow.setContent(info);
	infoWindow.open(map,marker); 
	});
	}

function initialize() {
	var latlng = new google.maps.LatLng(30.145127, 3.515625);
 
	var mapOpts = {
	zoom: 2,
	center: latlng,
	mapTypeId: google.maps.MapTypeId.TERRAIN,
	mapTypeControl: false,
	};
 
	var map = new google.maps.Map(document.getElementById("map"), mapOpts);
 
	downloadUrl("myxml.xml", function(data) {
	var xmlDoc = xmlParse(data);
	var records = xmlDoc.getElementsByTagName("marker");
 
	for (var i = 0; i < records.length; i++) {
	var rec = records[i];
	
 	var title = rec.getAttribute("title"); <!-- this is my title code but not works.-->
	var vaka = rec.getAttribute("vaka");
	var lat = parseFloat(rec.getAttribute("lat"));
	var lng = parseFloat(rec.getAttribute("lon"));
 
	var marker = new google.maps.LatLng(lat,lng);
 
	var html_text = vaka;
	createMarker(marker,html_text,map);
	}
	});
	}
</script>

This is myxml.xml code;

<shapes>
<marker lat="37.775786" lon="29.085789" title="some title1" vaka="some data1" />
<marker lat="38.383012" lon="27.179468" title="some title2" vaka="soma data2" />
</shapes>

Thank you for your helps...