[jQuery] IF. What am I doing wrong?

Hello,

I have the following code:

alert($.cookies.get("WCA.Player"));
var cookie = $.cookies.get("WCA.Player");
if (cookie == null || cookie == 'Play') {
$("#JPlayer").play();
}

The alert gives me the correct value which is null or 'Play' but the
if is not working correctly.
Am I doing something wrong?

Thanks,
Miguel