var osm = L.tileLayer("http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"),
    mqi = L.tileLayer("http://{s}.mqcdn.com/tiles/1.0.0/sat/{z}/{x}/{y}.png", {subdomains: ['otile1','otile2','otile3','otile4']});

var baseMaps = {
    "OpenStreetMap": osm,
    "MapQuestImagery": mqi
};

var overlays =  {//add any overlays here

    };

L.control.layers(baseMaps,overlays, {position: 'bottomleft'}).addTo(map);