Toggling CartoDB layer

<!DOCTYPE html>
<html>
  <head>
    <title>Leaflet multilayer example | CartoDB.js</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
    <link rel="shortcut icon" href="https://cartodb.com/assets/favicon.ico" />
    <style>
      html, body, #map {
        height: 100%;
        padding: 0;
        margin: 0;
      }
    </style>
 
    <link rel="stylesheet" href="https://libs.cartocdn.com/cartodb.js/v3/themes/css/cartodb.css" />
    
 
  </head>
  <body>
    <div id="map"></div>
 
    
    <script src="https://libs.cartocdn.com/cartodb.js/v3/cartodb.js"></script>
    <script>
 
      function main() {
 
        // create leaflet map
        var map = L.map('map', { 
          zoomControl: false,
          center: [43, 0],
          zoom: 3
        })
 
        // add a base layer
        L.tileLayer('https://tile.stamen.com/toner/{z}/{x}/{y}.png', {
          attribution: 'Stamen'
        }).addTo(map);
 
        // add cartodb layer with one sublayer
        cartodb.createLayer(map, 'https://xavijam.cartodb.com/api/v2/viz/f743c260-7dda-11e3-bf78-3085a9a9563c/viz.json')
        .addTo(map)
        .done(function(layer) {
          setTimeout(function() { layer.hide() }, 2000)
        });
 
 
      }
 
      // you could use $(window).load(main);
      window.onload = main; 
 
    </script>
 
  </body>
</html>

Modified http://libs.cartocdn.com/cartodb.js/v3/cartodb.js to a secure url

https://libs.cartocdn.com/cartodb.js/v3/cartodb.js