var map;

window.onload = addCodeToFunction(window.onload,function() {
  if (GBrowserIsCompatible()) {
    var opts = {size: new GSize(520,500)};
    map = new GMap2(document.getElementById("map"), opts);
	var point = new GLatLng(lat, lng);
	map.setCenter(point, map_zoom);
	marker = new GMarker(point);
    map.addOverlay(marker);
  }
});

window.onunload = GUnload();