title: Stop page execution like the alert() function
body: <p>When I write <code>alert('Hello')</code>, the page execution stops and waits for approval to continue.</p>
  
  <p>I have a  <em>div</em> setup to display as a fake alert, using HTML - this <code>div</code> has an 'OK' button.</p>
  
  <p>I want the page to stop its execution (just like alert does) until the user click 'OK'.</p>
  
  <p>Is it possible ?</p>