유튜브 위로 z-index 안먹을 때

<script type="text/javascript">
$(document).ready(function() {
		$("iframe").each(function(){
				var ifr_source = $(this).attr('src');
				var wmode = "wmode=transparent";
				if(ifr_source.indexOf('?') != -1) {
						var getQString = ifr_source.split('?');
						var oldString = getQString[1];
						var newString = getQString[0];
						$(this).attr('src',newString+'?'+wmode+'&'+oldString);
				}
				else $(this).attr('src',ifr_source+'?'+wmode);
		});
});
</script>