If you enter an invalid video id in YouTube (e.g. http://www.youtube.com/watch?v=XXX) it will redirect you to a page saying it is a malformed video ID. Is there a way to get the original URL (in this example "http://www.youtube.com/watch?v=XXX") in javascript?
(I'm talking about Javascript that will run on the browser after the redirect, through Firebug)