geolocation.js

if (!navigator.geolocation) {
  
navigator.geolocation = (function (window, document) {
  function getCurrentPosition(callback) {
    var geourl = 'http://www.google.com/jsapi?' + 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.google.loader.ClientLocation.latitude,
          longitude: win.google.loader.ClientLocation.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, document);
  
}