Demo varsa görelim...

Edit:

Aşağıdaki gibi dener misin?
<script type="text/javascript">
	jwplayer('mediaspace').setup({
		'flashplayer': 'http://xxxxxxxx.com/xxx/player.swf',
		'file': 'http://www.youtube.com/watch?v=<?=$url?>',
		'screencolor': '000000',
		'width': '590',
		'height': '390',
		'stretching': 'fill',
		'skin': 'http://xxxxxxxx.com/xxx/glow.zip',
		'abouttext': 'xxxxxxxx.com',
		'aboutlink': 'http://www.xxxxxxxx.com/'
	});
</script>
<div id="player"></div>
<div style="clear:both"></div>
Veya böyle
<div id="player">
<script type="text/javascript">
	jwplayer('mediaspace').setup({
		'flashplayer': 'http://xxxxxxxx.com/xxx/player.swf',
		'file': 'http://www.youtube.com/watch?v=<?=$url?>',
		'screencolor': '000000',
		'width': '590',
		'height': '390',
		'stretching': 'fill',
		'skin': 'http://xxxxxxxx.com/xxx/glow.zip',
		'abouttext': 'xxxxxxxx.com',
		'aboutlink': 'http://www.xxxxxxxx.com/'
	});
</script>
</div>
<div style="clear:both"></div>