gistfile1.js

	function updateLocation() {
	    if (geolocation) {
	        geolocation.getCurrentPosition(function (position) {
	            $.getJSON(
	                "http://ws.geonames.org/findNearestAddressJSON?callback=?",
	                {
	                    lat : position.coords.latitude,
	                    lng : position.coords.longitude
	                },
	                function (data) {
	                    $(function () {
	                        $('#zip').text(data.address.postalcode);
	                    });
	                }
	            );
	        });
	    }
	}
	
	$('#myButton').click(function(){updateLocation()});