title: View only certain parts of an image
body: <p>Hi I'd like to only be able to see a certain part of an image on my site, and I think if I rememer correctly I need to use javascript for this? Could anyone give me a code for this?</p>
  
  <p>More specifically, this is the image:</p>
  
  <p><img src="https://i.stack.imgur.com/mNhGE.png" alt="enter image description here"></p>
  
  <p>I'd like to be only able to see the front of the head. The diagram for this image is:
  <img src="https://i.stack.imgur.com/k1eEl.png" alt="enter image description here"></p>
  
  <p>Thanks. If this is not on the right website, it would be great if it could be moved.</p>