title: Show ID for image clicked
body: <p>My HTML is like so:</p>
  
  <pre><code>    &lt;img src="/path" id="img_1"&gt;
      &lt;img src="/path" id="img_2"&gt;
      &lt;img src="/path" id="img_3"&gt;
      &lt;img src="/path" id="img_4"&gt;
  </code></pre>
  
  <p>I want to alert out the id of the button that was clicked.</p>
  
  <p>How can I accomplish that?</p>