geo.js

function success(position) {
  var s = document.querySelector('#status');
  s.innerHTML = "found you at " + position.coords.latitude + " " + position.coords.longitude;  
}

function error(msg) {
  var s = document.querySelector('#status');
  s.innerHTML = typeof msg == 'string' ? msg : "failed";  
}

if (navigator.geolocation) {
  navigator.geolocation.getCurrentPosition(success, error);
} else {
  error('not supported');
}