Thanks for your response.
  I didn't exactly understand what you said! (I did log out of Yahoo Mail
before trying to log in.) But I tried this for another website
(www.blogfa.com) and it worked. What is the problem with Yahoo Mail again?
What shall I do to be able to use this method for Yahoo Mail too?  Indeed I
want to finally use this to login to www.orkut.com, but this website is
filtered here and I can't access it without some extra website that breaks the
filter. I have another problem here. How can I access Orkut with HTTrack, when
it cannot be accessed simply by typing a URL? The program I use to access
Orkut opens a website in which I type the URL of my desired (and filtered)
website, and it opens an IE browser showing the website, here Orkut. This
browser it opens has its own proxy settings, I tried following the CatchURL
instructions, but I got the same mirror error. I know this method did not work
here, I didn't get the page that says "HTTrack has caught the URL and you can
change the settings" after login.
  Have you ever tried this?
Thanx.