Please help, Redirect after login from non VB page.

[telc]

I would like to put a VB login form on a non VB page. I know how to do this, 'but' I would like it to redirect them back to the page they where one, after they are logged in.

So it I had a page www.foo.com/test.html with a VB form to login. I would like it to redirect them back to test.html after they are logged in. I could create a hidden input field called "redirect_url" so it gets posted to member.php when they try to login, but im not sure how to do the redirect code member.php.