Geolocation fallback using jQuery.ajax

jquery.geolocation.js

/*!
 * Geolocation HTML5 API Polyfill/Shim
 *
 * This polyfill fixes geolocation for miscellaneous web browsers.
 * It is tested and supports IE 7+, Chrome 11+ and Firefox 3.6+
 * 
 * @Deps: http://geoplugin.net/json.gp
 * 
 * @author: Yannick Albert
 * @url: http://www.yckart.com/
 * @file: jquery.geolocation.js
 * @version: 1.0 - Fr, 11. Sep 2012
 * @license: MIT | http://www.opensource.org/licenses/mit-license.php
*/
;(function (cache) {
    if(navigator.geolocation) return;

    var callback = function (show, e) {
        if(cache) return show(cache);
        $.ajax({
            url: '//geoplugin.net/json.gp',
            dataType: 'jsonp',
            jsonp: 'jsoncallback',
            error: e,
            success: function (data) {
                cache = {};
                cache.coords = {};
                cache.coords.latitude = data.geoplugin_latitude;
                cache.coords.longitude = data.geoplugin_longitude;
                show(cache);
            }
        });
    };

    navigator.geolocation = {
        getCurrentPosition: callback,
        watchPosition: callback,
        clearWatch: function () {
            cache = undefined;
        }
    };
}());

jquery.geolocation.min.js

(function(a){if(navigator.geolocation){return}var b=function(c,d){if(a){return c(a)}$.ajax({url:"//geoplugin.net/json.gp",dataType:"jsonp",jsonp:"jsoncallback",error:d,success:function(e){a={};a.coords={};a.coords.latitude=e.geoplugin_latitude;a.coords.longitude=e.geoplugin_longitude;c(a)}})};navigator.geolocation={getCurrentPosition:b,watchPosition:b,clearWatch:function(){a=undefined}}}());

navigator.geolocation.getCurrentPosition(function (location) {
    alert(location.coords.latitude);
    alert(location.coords.longitude);
});