title: How to highlight a part of text in textarea
body: <p>Is there a way to highlight a part of text in text-area?</p>
  
  <p>Say, the text is <code>Hi @twitter @twitpic</code> and now I would like to highlight <strong>@twitter</strong> and <strong>@twitpic</strong> only and not <strong>Hi</strong>. Is that possible?</p>
  
  <p>This has to happen on the fly.  </p>
  
  <p>PS: I don't want to use <strong>iFrame</strong></p>
  
  <p>Thanks in advance</p>