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<link rel="stylesheet" href="http://libs.cartocdn.com/cartodb.js/v3/3.11/themes/css/cartodb.css" />

...

<div id="map"></div>

...

<script src="http://libs.cartocdn.com/cartodb.js/v3/3.11/cartodb.js"></script>
<script>
// get the viz.json url from the CartoDB Editor
// - click on visualize
// - create new visualization
// - make visualization public
// - click on publish
// - go to API tab

window.onload = function() {
  cartodb.createVis('map', 'http://documentation.cartodb.com/api/v2/viz/2b13c956-e7c1-11e2-806b-5404a6a683d5/viz.json');
}
</script>