div idlerini farklı vermelisiniz.

örneğin
1. player

Alıntı
<script type='text/javascript' src='swfobject.js'></script>

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

<script type='text/javascript'>
var so = new SWFObject('player.swf','ply','470','320','9','#fff fff');
so.addParam('allowfullscreen','true');
so.addParam('allowscriptaccess','always');
so.addParam('wmode','opaque');
so.addVariable('file','http://content.longtailvideo.com/videos/flvplayer.flv');
so.write('mediaspace');
</script>
2. player (dikkat edin swfobject sadece bir kere include etmek yeterli)
Alıntı

<div id='mediaspace1'>This text will be replaced</div>

<script type='text/javascript'>
var so = new SWFObject('player.swf','ply','470','320','9','#fff fff');
so.addParam('allowfullscreen','true');
so.addParam('allowscriptaccess','always');
so.addParam('wmode','opaque');
so.addVariable('file','http://content.longtailvideo.com/videos/flvplayer.flv');
so.write('mediaspace1');
</script>
3. player

Alıntı

<div id='mediaspace2'>This text will be replaced</div>

<script type='text/javascript'>
var so = new SWFObject('player.swf','ply','470','320','9','#fff fff');
so.addParam('allowfullscreen','true');
so.addParam('allowscriptaccess','always');
so.addParam('wmode','opaque');
so.addVariable('file','http://content.longtailvideo.com/videos/flvplayer.flv');
so.write('mediaspace2');
</script>