gistfile1.js

// geo-location bridge
function getLocation(callback){
  
  if (getLocation.cache) return callback(getLocation.cache);
    
  if (Modernizr.geolocation) {
    var geocallback = function(position) {
      callback(getLocation.cache = {
        "lat": position.coords.latitude, 
        "lon": position.coords.longitude,
        "obj": position
      })
    };
    
    navigator.geolocation.getCurrentPosition(geocallback);
    navigator.geolocation.watchCurrentPosition(geocallback);
    
  } else {
  
    $.getScript('//www.google.com/jsapi',function(){
      callback(getLocation.cache = {
        "lat": google.loader.ClientLocation.latitude, 
        "lon": google.loader.ClientLocation.longitude,
        "obj": google.loader.ClientLocation
      })
    });
  }
}

// usage
getLocation(function(pos){
  console.log("I'm located at ",pos.lat,' and ',pos.lon);
})