cookie problem

Hi, I have a question about the retrival of cookie value. I have set a cookie in the secure web server page. in https://domain.com/setcookie.php setcookie("xxxxx",$value,0,"www.domain.com",0); I wonder why can't i retrive the value of the cookie in a non-secure web server enviroment. As stated in the manual if the last values is 0, the cookie can be retirve in a non-secure web server environment, but i cannot. in http://domain.com/cookie_value.php echo $xxxxx; -->the values of the cookie contains nothing. but in https://domina.com/cookie_value.php echo $xxxx --> i can see the values. Please point me out the error, thank you. Mark Lo