[YouTube-API] How can I change theme (load player into a swf file)

How can I change theme (load youtube player to an swf)
I know I can use Chromeless Player to make own theme ,but if I just want to use existing theme

var loader:Loader= new Loader();
loader.contentLoaderInfo.addEventListener(Event.INIT, onLoaderInit);
loader.load(new URLRequest("http://www.youtube.com/v/"+vid_id+"?version=3"));

It works , but what if I want to change theme to that dark one ?
I tried. below ,but nothing happened

loader.load(new URLRequest("http://www.youtube.com/v/"+vid_id+"&theme=dark&color=red&fs=1&version=3"));

Is there a way to change theme ?

Sorry for my English

Thank you

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