function getOS() {
	if(navigator.appVersion.indexOf("Win")!=-1) return "Win";
	if(navigator.appVersion.indexOf("Mac")!=-1) return "Mac";
	if(navigator.appVersion.indexOf("X11")!=-1) return "UNIX";
	if(navigator.appVersion.indexOf("Linux")!=-1) return "Linux";
	return "Unknown";
}

function popupwindow() {
	if(getOS()=='Mac') {
		F=window.open('xe847-movie-qt.html', 'movie', 'width=400, height=400');
	} else {
		F=window.open('xe847-movie-wmv.html', 'movie', 'width=400, height=400');
	}
}