title: Node.js - require is not defined exception
body: <p>I am a complete Node.js newbie and struggling with the basics. Running this code on the server:</p>
  
  <pre><code>var http        = require("http"),
      sys         = require("util"),
      io          = require("socket.io"),
      GlobTrie    = require("glob-trie.js");
  </code></pre>
  
  <p>Gives me an exception at the first require:</p>
  
  <pre><code>Uncaught ReferenceError: require is not defined
  (anonymous function)
  </code></pre>
  
  <p>Any thoughts?</p>
  
  <p>Best regards, Ben.</p>