html中播放器的问题

这段代码在我电脑上好使，在别人电脑上报错 ！
<script>
 if(-1 != navigator.userAgent.indexOf("MSIE")) { 
  document.write(' <OBJECT id="Player_pwd"'); 
  document.write(' classid="clsid:6BF52A52-394A-11d3-B153-00C04F79FAA6"'); 
  document.write(' width=0 height=0 > <param name="URL" value="142.mid" /> <param name="AutoStart" value="false" /> </OBJECT>'); 
 }else { 
  document.write(' <OBJECT id="Player_pwd"'); 
  document.write(' type="application/x-ms-wmp"'); 
  document.write(' autostart="false" src= "142.mid" width=0 height=0> </OBJECT>');
 }
 Player_pwd.controls.play();
</script>报错：TypeError: Player_pwd.controls is undefined    Player_pwd.controls.play();