Takes Youtube and makes it full browser window

fulltube.js

javascript: (function() {
    var u = document.location.href;
    if(!u) { alert('Try using on Youtube'); return; }

    if(u.indexOf('youtube.com') == -1) {
        alert('Try using on Youtube'); return;
    }

    var m = u.match(/v=([\w\d]+)/);
    if(!m) {
       alert('Invalid Youtube URL'); return;
    }

    var n = "http://www.youtube.com/v/" + m[1];
    document.location.href= n;
}());

http://jsfiddle.net/#&togetherjs=q9kAwPx9e4