title: append string to image src using js
body: <p>I've got a page where there is <code>&lt;img src="/images/product/whatever-image.jpg" alt="" /&gt;</code></p>
  
  <p>I want it so that upon loading of the page, the string "?Action=thumbnail" is appended to src's value, making it <code>src="/images/product/whatever-image.jpg?Action=thumbnail"</code></p>
  
  <p>how do I achieve this using js?</p>