Tab Bar Plugin dosen't work in Internet Explorer

<div id='mediaspace'>This text will be replaced</div>

<script type='text/javascript'>
  var so = new SWFObject('player.swf','mp1','730','340','9','#ffffff');
  so.addParam('allowfullscreen','true');
  so.addParam('allowscriptaccess','always');

  so.addParam('wmode','opaque');
  so.addVariable("plugins", "plugins/tabbar/tabbar.swf,plugins/infobox/infobox.swf");
so.addVariable('tabbar.titles','Welcome,Cosmetic Dentistry,Rejuvenation,Patient Testimonials');
  so.addVariable('tabbar.links','Playlist/mrss.xml,Playlist/mrss1.xml,Playlist/mrss2.xml,Playlist/mrss3.xml');
  so.addVariable('abouttext','My Media Player');
  so.addVariable('infobox.color','FFFFFF');
  so.addVariable('infobox.position','bottom');
  so.addVariable('infobox.size','80');
  so.addVariable('file','Playlist/mrss.xml');
  so.addVariable('backcolor','000000');
  so.addVariable('frontcolor','CCCCCC');
  so.addVariable('lightcolor','FFFFFF');
  so.addVariable('screencolor','000000');
  so.addVariable('playlistsize','310');
  so.addVariable('bufferlength','18');
  so.addVariable('playlist','right');

  so.addVariable('stretching','exactfit');
  so.write('mediaspace');
</script>