title: function name(e) in Javascript
body: <p>As a complete Javascript novice I'm challenged by some simple concentps.</p>
  <p>When I'm doing my javascript I'll often see stuff like this</p>
  <pre><code>function name(e) {
  
      if(e.KeyCode) { 
          ....
      }
  }
  </code></pre>
  <p>What does doing this accomplish? What's the <code>e</code> all about?</p>