title: use jwplayer to get current play time
body: <p>I am using <a href="http://www.longtailvideo.com/support/jw-player/jw-player-for-flash-v5/15990/about-the-jw-player" rel="noreferrer">jwplayer</a> to play embedded video,
  the <a href="http://www.longtailvideo.com/support/jw-player/jw-player-for-flash-v5/16023/getting-values-from-the-player" rel="noreferrer">javascript api</a> tells me </p>
  
  <p><code>jwplayer("mediaplayer").getPosition()</code> </p>
  
  <p>will get the current position, but my result is <code>undefined</code></p>
  
  <p>Can anyone help me get the correct resilts</p>