title: change thumbnail attribute in wordpress?
body: <p>Is it possible to change the value of the <code>src</code> attribute to another value, and insert the original <code>src</code> value attribute into the new <code>data-src</code> attribute with <code>the_post_thumbnail()</code> function ?<br/><br/>
  Understood? I want to change this</p>
  
  <pre><code>&lt;img src="img url"&gt;
  </code></pre>
  
  <p>to</p>
  
  <pre><code>&lt;img src="another image" data-src="img url"&gt;
  </code></pre>
  
  <p>Thank you</p>