function initialize() {
	if (GBrowserIsCompatible()) {
		var map = new GMap2(document.getElementById("mapa"));
		map.setCenter(new GLatLng(41.629753,-4.736127), 15);
		map.setUIToDefault();
		
		var baseIcon = new GIcon(G_DEFAULT_ICON);
		baseIcon.shadow = "http://www.google.com/mapfiles/shadow50.png";
		baseIcon.iconSize = new GSize(20, 34);
		baseIcon.shadowSize = new GSize(37, 34);
		baseIcon.iconAnchor = new GPoint(9, 34);
		baseIcon.infoWindowAnchor = new GPoint(9, 2);
		
		function createMarker(point, index) {
			var letter = String.fromCharCode("A".charCodeAt(0) + index);
			var letteredIcon = new GIcon(baseIcon);
			letteredIcon.image = "http://www.google.com/mapfiles/marker.png";
			
			markerOptions = { icon:letteredIcon };
			var marker = new GMarker(point, markerOptions);
			
			GEvent.addListener(marker, "click", function() {
				if (letter == "A")
					marker.openInfoWindowHtml("<b>Oficinas Centrales</b><br />C/ Fern&aacute;ndez Ladreda, 13, Parcela 55<br />Polígono de Argales<br />47008 	Valladolid");
				});
			return marker;
		}
		var latlngA = new GLatLng(41.627616,-4.73607);
		map.addOverlay(createMarker(latlngA, 0));
	}
}