tmcw/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title></title>
  <script src='//api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.js'></script>
  <link href='//api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.css' rel='stylesheet' />
  <!--[if lte IE 8]>
    <link href='//api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.ie.css' rel='stylesheet'>
  <![endif]-->
  <style>
    body { margin:0; padding:0; }
    #map { position:absolute; top:0; bottom:0; width:100%; }
  </style>
</head>
<body>
<div id='map'></div>
<script type='text/javascript'>
var map = L.mapbox.map('map', 'examples.map-9ijuk24y')
    .setView([40, -74.50], 9);

var layerOne = L.mapbox.markerLayer({
    type: 'FeatureCollection',
    features: [{
        "type": "Feature",
        "geometry": {
            "type": "Point",
            "coordinates": [-75.00, 40]
        },
        "properties": {
            "title": "Small kitten"
        }
    }]
});

var layerTwo = L.mapbox.markerLayer();

layerTwo.on('layeradd', function(e) {
    var marker = e.layer,
        feature = marker.feature;

    marker.setIcon(L.mapbox.marker.icon({
        'marker-color': '#f00'
    }));
});

layerTwo.setGeoJSON({
        type: 'FeatureCollection',
        features: [{
            "type": "Feature",
            "geometry": {
                "type": "Point",
                "coordinates": [-75.00, 40.1]
            },
            "properties": {
                "title": "Small kitten"
            }
        }]
    });

layerOne.addTo(map);
layerTwo.addTo(map);

</script>
</body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset=utf-8 />
	<title></title>
	<script src='//api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.js'></script>
	<link href='//api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.css' rel='stylesheet' />
	<!--[if lte IE 8]>
	<link href='//api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.ie.css' rel='stylesheet'>
	<![endif]-->
	<style>
	body { margin:0; padding:0; }
	#map { position:absolute; top:0; bottom:0; width:100%; }
	</style>
	</head>
	<body>
	<div id='map'></div>
	<script type='text/javascript'>
	var map = L.mapbox.map('map', 'examples.map-9ijuk24y')
	.setView([40, -74.50], 9);

	var layerOne = L.mapbox.markerLayer({
	type: 'FeatureCollection',
	features: [{
	"type": "Feature",
	"geometry": {
	"type": "Point",
	"coordinates": [-75.00, 40]
	},
	"properties": {
	"title": "Small kitten"
	}
	}]
	});

	var layerTwo = L.mapbox.markerLayer();

	layerTwo.on('layeradd', function(e) {
	var marker = e.layer,
	feature = marker.feature;

	marker.setIcon(L.mapbox.marker.icon({
	'marker-color': '#f00'
	}));
	});

	layerTwo.setGeoJSON({
	type: 'FeatureCollection',
	features: [{
	"type": "Feature",
	"geometry": {
	"type": "Point",
	"coordinates": [-75.00, 40.1]
	},
	"properties": {
	"title": "Small kitten"
	}
	}]
	});

	layerOne.addTo(map);
	layerTwo.addTo(map);

	</script>
	</body>
	</html>