Untitled

<!DOCTYPE html>
<html>

  <head>
    <link rel="stylesheet" href="style.css">
    <script src="script.js"></script>
  </head>

  <body>
    <button onclick="myFunction()" >Display Image</button>
  </body>

</html>

// Code goes here

function myFunction() {
    var x = document.createElement("IMG");
    x.setAttribute("src", "http://www.w3schools.com/jsref/compman.gif");
    x.setAttribute("width", "304");
    x.setAttribute("width", "228");
    x.setAttribute("alt", "The Pulpit Rock");
    document.body.appendChild(x);
}

/* Styles go here */