open an infowindow example

## index.html
<!DOCTYPE html>
<html>
  <head>
    <title>Easy 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="http://cartodb.com/assets/favicon.ico" />
    <style>
      html, body, #map {
        height: 100%;
        padding: 0;
        margin: 0;
      }
      .list {
        position: absolute;
        background: white;
        top: 180px;
        left: 20px;
        padding: 20px;
        z-index: 10;
      }
    </style>

    <link rel="stylesheet" href="http://libs.cartocdn.com/cartodb.js/v3/themes/css/cartodb.css" />
    <!--[if lte IE 8]>
        <link rel="stylesheet" href="http://libs.cartocdn.com/cartodb.js/v3/themes/css/cartodb.ie.css" />
    <![endif]-->
  </head>
  <body>
    <div id="map"></div>
    <div class="list">
      <a href="#" class="link">open infowindow</a>
    </div>

    <!-- include cartodb.js library -->
    <script src="http://libs.cartocdn.com/cartodb.js/v3/cartodb.uncompressed.js"></script>

    <script>
      function openInfowindow(layer, latlng, cartodb_id) {
        layer.trigger('featureClick', null, latlng, null, { cartodb_id: cartodb_id }, 0);
      }


      function main() {

        cartodb.createVis('map', 'http://documentation.cartodb.com/api/v2/viz/7eb2096a-51d9-11e3-89a7-5404a6a683d5/viz.json', {
            shareable: false,
            title: false,
            description: false,
            search: false,
            tiles_loader: true,
            center_lat: 42,
            center_lon: -3,
            zoom: 6,
            legends: false
        })
        .done(function(vis, layers) {
          // layer 0 is the base layer, layer 1 is cartodb layer
          var layer = layers[1];
          $('.link').click(function() {
            openInfowindow(layer, [40.4000262645, -3.683351686], 5324)
            return false;
          });

        })
        .error(function(err) {
          console.log(err);
        });
      }

      window.onload = main;
    </script>
  </body>
</html>