map.js

$(document).ready(function() {
    // See http://mapbox.com/mapbox.js/api/v0.6.6/#mapbox.auto
    mapbox.auto('map', 'villeda.map-up0fpg1g', function(map, tiledata) {
        var querystring = location.search.replace( '?', '' ).split( '&' ), params = {};
        for (var i = 0; i < querystring.length; i++ ) {
            var name = querystring[i].split('=')[0],
            value = querystring[i].split('=')[1];
            params[name] = value;
        }
        if (params.lon && params.lat) {
            var features = [{
                geometry: {type: "Point", coordinates: [params.lon * 1, params.lat * 1]},
                properties: {image: "http://cdn.leafletjs.com/leaflet-0.4/images/marker-icon.png"}
            }];
            // See http://mapbox.com/mapbox.js/api/v0.6.6/#map.addLayer
            map.addLayer(mapbox.markers.layer().features(features));
            // See http://mapbox.com/mapbox.js/api/v0.6.6/#map.center
            map.center({lon: params.lon, lat: params.lat}).zoom(14);
        }
    });
});