title: Track impressions from image src tag
body: <p>I need to include an image tag that references a script:</p>
  
  <pre><code>&lt;img src="http://the.site./script.php"/&gt;
  </code></pre>
  
  <p>But I'm not sure of how to make this invisible. Sort of behind the scenes to track impressions.</p>
  
  <p>2 Questions:</p>
  
  <ol>
  <li><p>How do I properly layout the  tag?</p></li>
  <li><p>What would script.php contain?</p></li>
  </ol>