title: rvest: how to follow_link an image in a webpage?
body: <p>I need to click a link which is actually an image in the html file (the UCR logo on the top left), how should I do this?
      I have the following code:</p>
  
  <pre><code>url &lt;- "http://ringmaster.cs.ucr.edu/Rings.html"
  p &lt;- html_session(url)
  p %&gt;% follow_link("")
  </code></pre>
  
  <p>The html code for the logo is:</p>
  
  <pre><code> &lt;a href ="http://www.ucr.edu/"&gt;   
  &lt;img class="pos_fixed" src="images/ucr_logo.jpg"  &gt;   
  &lt;/a&gt;
  </code></pre>
  
  <p>I greatly appreciate it.</p>