session

Hi, Is there anybody can help to do this: My web site has 3 pages :a.php, b.php and c.php. I want to capture the session in those 3 pages. Without an id, visitor can't view my page. When visitors leave the site, thier session should be removed. The problem is how to remove the session. I have tried several function of session such as session_destroy(), session_unregister. But, i still faild to clear the session. What should i do? For ur information, the session.cookie_lifetime is set to 0 in my server. Should i change the value? If yes, then how to do it? Please give me your hands, thank you.... E K _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.