I am embedding a youtube video in a scene, but when I load the youtube video it shows the big play button in the middle of the video instead of just playing. Can anyone please tell me the line of code to kick the thing into action automatically?

Code:
on (press) {
	stopAllSounds();
	
	System.security.allowDomain("http://www.youtube.com"); 
	System.security.loadPolicyFile("http://www.youtube.com/crossdomain.xml"); 
	
	var ldsceneholder = new MovieClipLoader();
	ldsceneholder.loadClip("http://www.youtube.com/v/IMGYpOxvHDk.swf", mc100);
	ldsceneholder.onLoadInit = function(mc) {
		mc100._width = 50;
		mc100._height = 50;
	}
}