title: getScript - How to only call if not already called
body: <p>on a Click, the following gets loaded:</p>
  
  <pre><code>$.getScript('/javascripts/contacts.js');
  </code></pre>
  
  <p>How can I write a statement that says</p>
  
  <p>if the getScript above is already loaded do X,, if not loaded it, do Y...?</p>
  
  <p>Thanks</p>