function geodeAsk()
{
 if (navigator.geolocation)
  navigator.geolocation.getCurrentPosition(geoFound, geoNotFound);
}

function geoFound(pos)
{
 var lat = pos.latitude;
 var lon = pos.longitude;
 alert(lat + ', ' + lon);
}

function geoNotFound()
{
 alert('You must be on a wifi network for us to determine your location');
}   

// Ask the browser for its location
geodeAsk();