[Greasemonkey] Ajax Question (Redirect URL)

[Mark]

I was wondering if anyone knows of a way to get a redirect URL from an
xmlhttprequest.

Example: When I go to http://website.com?param=x, it sends me to
http://website.com?answer=y. The "y" is based on what I put in as "x",
but when you make an xmlhttprequest to http://website.com?param=x,
there is no way of retrieving the redirected url.

Any ideas?