title: JSON undefined in IE7
body: <p>I am using the following line of JQuery code:</p>
  
  <pre><code>$.get('/ajax/buy', {'categoryname':chosenSelected}, function(data) {
     data = JSON.parse(data);
  ...
  </code></pre>
  
  <p>However, when running it on IE7 I get this error message: <code>JSON undefined:</code>.</p>
  
  <p>How can I use the parser with compatibility to IE7 (and all major browsers)?</p>