title: document.write asynchronous (JavaScript)
body: <p>I've got some tracking code that I have to embed in the footer of my page.  The tracking code is from a 3rd party company and uses <code>document.write</code> which of course is blocking.  I've sent a support request to the company and they don't seem to have any interest in changing the code.</p>
  
  <p>The tracking code looks something like this:</p>
  
  <pre><code>document.write (
    '&lt;img src="http://company-url.com/visitor.gif?ts='+
    new Date().getTime()+
    '&amp;ref='+escape(document.referrer) + '"&gt;'
  );
  </code></pre>
  
  <p>So, my question is, is it possible to make <code>document.write</code> non blocking?</p>