title: Javascript - Transition
body: <p>I have this simple script in javascript to show and hide.</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
  function show(obj) {
  
  var el = document.getElementById(obj);
  var bota = document.getElementById("show");
  
      bota.style.visibility = 'hidden';
      el.style.display = 'block';
  
  }
  &lt;/script&gt;
  </code></pre>
  
  <p>How i do this with transitions?
  Thank!</p>