read the main domain cookie in sub domain

Hi, Assume, I have www.domain.com <http://www.domain.com/> in which I wrote the functionality for user authentication and his profile related functionality. Now, when user logs in using http://www.domain.com/users/login.php then after his successful login a session as well as a cookie is getting created. This will creates a cookie called myCookie123 Now I have my subdomain as http://sub.domain.com/index.php . here at the top I am checking whether the user is logged in or not, for that I have to check whether the cookie is created or not.. Here my problem is that, I am not getting the idea about, how to access or read the cookie of http://www.domain.com <http://www.domain.com/> from http://sub.domain.com/. can anyone please suggest me how to achieve this. Thanks In advance. Warm Regards, Sanjeev http://www.sanchanworld.com/ http://webdirectory.sanchanworld.com - Submit your website URL http://webhosting.sanchanworld.com - Choose your best web hosting plan