var map;var altitude;var coords;function initialize(){if(GBrowserIsCompatible()){map=new GMap2(document.getElementById("map_canvas"));map.setCenter(new GLatLng(39.5,-8),7);map.setUIToDefault();GEvent.addListener(map,"click",onMapClick);}} function onMapClick(overlay,latlng){if(latlng){coords=latlng;request='http://ws.geonames.org/astergdemJSON?lat='+latlng.y+'&lng='+latlng.x+'&callback=showAltitude';aObj=new JSONscriptRequest(request);aObj.buildScriptTag();aObj.addScriptTag();}} function showAltitude(jData){altitude=jData.astergdem;var myHtml="Coords: "+coords+" Altitude: "+altitude;map.openInfoWindow(coords,myHtml);}