gistfile1.txt

      var map = new L.Map('map_canvas', {
        center: [0,0],
        zoom: 2
      });

        // add a nice baselayer from Stamen 
      L.tileLayer('http://{s}.tile.stamen.com/toner/{z}/{x}/{y}.png', {
          attribution: 'Stamen'
      }).addTo(map);
        
      cartodb.createLayer(map, 'your-vis-json')
        .addTo(map)
        .on('done', function(layer) {
            //do stuff
        })
        .on('error', function(err) {
          alert("some error occurred: " + err);
        });