title: How to render random backgrounds with HTML5 Scratch Card
body: <p>I am using HTML5 Scratch Card plugin and dont know how I can render random backgrounds with javascript.Here is the code </p>
  
  <pre><code>window.onload = function() {
              createScratchCard({
                  'container':document.getElementById('circle'),
                  'background':'assets/images/demo2-circle-background.png',
                  'foreground':'assets/images/demo2-circle-foreground.png',
                  'percent':100,
                  'coin':'assets/images/coin2.png',
                  'thickness':18,
              });
          }
  </code></pre>
  
  <p>So with this default structure how I can render random 2, 3 images and show one every time, show randomly></p>