About Setcookie function

Hi There I am having small probem in how to set the cookies to all my sub-domains ?? I tried the all possible choises I know : "/" & ".mydomain.net" & ".mydomain.net." but no one it work with me :( ... and I want to make it clear : if u set the cookies path to "/" with the following urls : http://www.mydomain.net/chat/ (it will work fine ) http://chat.mydomain.net/ (it will not work !! ) and http://www.mydomain.net/login/ (it will work fine ) http://login.mydomain.net/ (it will not work !! ) So , how to set the cookies for the all domains in my host ?? not the directories ?? Best Regards AlNadabi ============================== AlNadabi Network http://www.alnadabi.net