title: Loading an HTML file into a DIV with a link
body: <p>There are several topics on this, but none that completely answer my question. </p>
  
  <p>I would like to be able to have a link which loads a whole HTML file into a DIV.</p>
  
  <p>This, for example, will load just text into my "MainBack" DIV. It works fine:</p>
  
  <pre><code>&lt;a href="#computing" onclick="document.getElementById('MainBack').innerHTML = '&lt;p&gt;1&lt;/p&gt;';"&gt;Computing&lt;/a&gt;
  </code></pre>
  
  <p>but I would like to load an entire file into it like this:</p>
  
  <pre><code>&lt;a href="#computing" onclick="document.getElementById('MainBack').innerHTML = 'HTML FILE';"&gt;Computing&lt;/a&gt;
  </code></pre>
  
  <p>Any advice? I'm pretty new to this!</p>