geolocation.js

if (!navigator.geolocation) {
  
navigator.geolocation = (function (window) {
  function getCurrentPosition(callback) {
    // NOTE: for some reason, chaging the url is *allowed* with this service. Useful, but random
    // source: http://www.maxmind.com/app/javascript_city
    // The source is open source, as per: http://www.maxmind.com/app/api, but doesn't discuss specific license use. Hopefully it's just free to use - yay internet!
    var geourl = 'http://j.maxmind.com/app/geoip.js_' + Math.random(),
        iframe = document.createElement('iframe'),
        doc, win;

    iframe.style.display = 'none';
    window.document.body.appendChild(iframe);
    
    doc = iframe.contentDocument || iframe.contentWindow.document;
    win = iframe.contentWindow;
    
    // once the script has loaded, it triggers an onload event
    // TODO: cross browser test
    iframe.onload = function () {
      // assign all the captured values across to our geo object
      var geo = {
        coords: {
          latitude: win.geoip_latitude(),
          longitude: win.geoip_longitude()
          // other values are supported, i.e. accuracy, speed, heading, etc
        },
        timestamp: (new Date()).getTime()
      };
      // then remove the iframe from the body to clear the memory...I hope!
      window.document.body.removeChild(iframe);
      callback.call(callback, geo);
    };
    
    // create a document on the fly
    doc.open();
    doc.write('<' + 'script src="' + geourl + '"><' + '/script>');
    doc.close();    
  }
  
  
  return {
    clearWatch: function () {},
    getCurrentPosition: getCurrentPosition,
    // TODO shouldn't be too difficult :)
    watchPosition: function () {}
  };
})(this);
  
}