// ==UserScript==
// @name           YouTube downloader
// @namespace      http://concentratedentropy.wordpress.com/
// @description    Download videos
// @include        http://*.youtube.com/watch?v=*
// ==/UserScript==

var s,h='',j=0;
if(document.getElementById('movie_player'))
{//not html5 mode
var f=document.getElementById('movie_player').getAttribute('flashvars');
var i=f.indexOf('&fmt_url_map=')+13;
s=unescape(f.substring(i,f.indexOf('&',i))).split(/,|\|/);
}
else
{
var v=unsafeWindow.videoPlayer.toSource();
var i=v.indexOf('html5_fmt_map:#')+17;
var x=eval(v.substring(i,1+v.indexOf(']',i)));//>eval
x.map(function(o){h+='<li style="display:inline;margin-right:0.5em"><a href="'+o.url+'">'+o.itag+'</a></li>';});
i=v.indexOf('fmt_url_map:')+13;
s=v.substring(i,v.indexOf('"',i+1)+1).split(/,|\|/);
}

for(;j<s.length;j+=2)
h+='<li style="display:inline;margin-right:0.5em"><a href="'+s[j+1]+'">'+s[j]+'</a></li>';
var a=document.getElementById('watch-description-extras');
var b=document.createElement('h4');
b.textContent='Download:';
var c=document.createElement('ul');
c.innerHTML=h;
a.appendChild(b);
a.appendChild(c);