function initialize() {
        var mapOptions = {
          zoom: 15,
          center: new google.maps.LatLng(38.443560506122380,-9.098943471908570),
          mapTypeId: google.maps.MapTypeId.ROADMAP
        }
        var map = new google.maps.Map(document.getElementById('map_canvas'),
                                      mapOptions);
		var transitLayer = new google.maps.TransitLayer();
		transitLayer.setMap(map);
        setMarkers(map, beaches);
      }
      var beaches = [
['Studio - from $7,-/wk',38.443560506122380,-9.098943471908570,'<div class="infoWindow"><a href="http://nycsapartments.com/ny-apartment/isaias_366.html" title="If you are looking for a typic..."><img src="http://nycsapartments.com/ny-apartment-images/10198sm.jpg" alt="Isaias" border="0" hspace="5" align="left" height="80"><div class="popuptitle">Isaias</div></a><div class="popup"><br>Studio - from $7,-/wk</div></div>','mm_20_red'],
['test2',0.000000000000000,0.000000000000000,'<div class="infoWindow"><img src="" alt="test2" border="0" hspace="5" align="left" height="80"><div class="popuptitle"><a href="" title="test2">test2</a><br><div class="popup"></div></div></div>','mm_20_blue'],
 ];

      function setMarkers(map, locations) {
		var shadow = new google.maps.MarkerImage('http://viennasapartments.com/images/mm_20_shadow.png',
			new google.maps.Size(22, 20),
			new google.maps.Point(0,0),
			new google.maps.Point(6, 20));
        for (var i = 0; i < locations.length; i++) {
          var beach = locations[i];
          var myLatLng = new google.maps.LatLng(beach[1], beach[2]);
		  var image = new google.maps.MarkerImage('http://viennasapartments.com/images/'+beach[4]+'.png',
			new google.maps.Size(12, 20),
			new google.maps.Point(0,0),
			new google.maps.Point(6, 20));
          var aptMarker = new google.maps.Marker({
              position: myLatLng,
              map: map,
              shadow: shadow,
              icon: image,
              title: beach[0],
              content: beach[3]
          });
		  var infowindow = new google.maps.InfoWindow({
			//content: beach[0]
		  });
		  google.maps.event.addListener(aptMarker, 'click', function() {
			  infowindow.setContent(this.content);
			  infowindow.open(map,this);
		  });
        }
      }

google.maps.event.addDomListener(window, 'load', initialize);