gmap.js

var latitude = -33.704959;
var longitude = -70.879347;
var description = "Santiago, Chile";
var startZoom = 15;
var map;

function addMarker(latitude, longitude, description) {
	var marker = new GMarker(new GLatLng(latitude, longitude));
	GEvent.addListener(marker, 'click',
		function() {
			marker.openInfoWindowHtml(description);
		}
	);
	
	map.addOverlay(marker);
	
}

function init() {
	if (GBrowserIsCompatible()) {
		map = new GMap2(document.getElementById("map"));
		map.addControl(new GLargeMapControl());
		var location = new GLatLng(latitude, longitude);
		map.setCenter(location, startZoom);
				
		addMarker(latitude, longitude, description);
	}
}

window.onload = init;
window.unload = GUnload;