index.html

<!DOCTYPE html>
<head>
  <script src="script.js"></script>
</head>

<html>

  <body onload="setup()">

    <select id="list" onchange="go()">
      <option value="">
      <option value="MC">MailChimp</option>
      <option value="CC" >Constant Contact</option>
      <option value="HS">HubSpot</option>
      <option value="AW">AWeber</option>
      <option value="AC">Active Campaign</option>
      <option value="M">Marketo</option>
      <option value="P">Pardot</option>
      <option value="E">Emma</option>
      <option value="GR">Get Response</option>
      <option value="CM">Campaign Monitor</option>
      <option value="iC">iContact</option>
      <option value="VR">Vertical Response</option>
      <option value="MM">Mad Mimi</option>
    </select>


    <p id="demo"></p>

  </body>
</html>