title: Making a img appear/disappear in html5
body: <p>I've used a button at this link:
  <a href="https://stackoverflow.com/questions/22076168/positioning-images-in-html-using-a-button-creating-images">Positioning Images in HTML (Using a button creating images)</a>
  ...But I want to know how to make the image disappear if it's already been placed by using a button. Hopefully this can use the same button. Any ideas?</p>