[support] display/hide a cck text field based on the input cck date field

Hi all, I'm trying to display/hide a cck field based on the input given in another field. My situation is i need to show a cck text field based on the server time...if it doesn't matches, I need to display another cck text field. I guess i can do this using "Computed fields". I read and got some clue from this post (http://drupal.org/node/182473 ) but yet i couldnt get this done . You can see my details in forum post here http://drupal.org/node/466694 . please help me guys. With regards Mohan