jQuery-geo.js

(function($){
  

$.geo = function(callback){
	if(!$.geo.data){
		$.ajax({
		cache: true,
		url: '//www.google.com/jsapi',
		dataType: "script",
		success: function(){
				try{
					$.geo.data = google.loader.ClientLocation.address;
				}
				catch(e){
					$.geo.data = {city: null, region: null, country: null, country_code:null};
				}
				callback.call(this, $.geo.data);
			}
		});
	}
	else{
		callback.call(this, $.geo.data);
	}
	
};

}(window.jQuery));

xmpl-usage.js

/* Pass a function to $.geo; the argument will be an object featuring the geo data, or null attributes if for some reason there's no geo data*/
$.geo(function(data){
   if(data.region === "NY"){
     $("#lightbox").text("Hello New York!");
   }
   else if(data.region === "CA"){
     $("#lightbox").text("Wes' coast!");

   }
   else if(!data.region){
    //no geo data
   }
});

/* Repeated usage will use cached values, so it only loads the JS once. */
$.geo(function(data){
  if(data.country_code && data.country_code !=="US"){
    $("#welcome").text("Buenos noches!");
  }
});