multi-domain cookies

[DarkReaper]

I'm trying to get the cookies vB sets to apply to all 3 domains my website uses(so you could go to forums.anydomain.com and be logged in) but it's not working quite right. In /admin/functions.php I changed this:

PHP Code:

  if ($cookiedomain) {
    setcookie($name, $value, $expire, $cookiepath, $cookiedomain, $secure);
  } else {
    setcookie($name, $value, $expire, $cookiepath, '', $secure);
  } 


To this:

PHP Code:

  setcookie($name, $value, $expire, $cookiepath, '.seriouscommunity.com', $secure);
  setcookie($name, $value, $expire, $cookiepath, '.seriouszone.com', $secure);
  setcookie($name, $value, $expire, $cookiepath, '.seriousengine.com', $secure); 


It didn't work though. What am I doing wrong?