[PHP] Wierd cookie behiavor

[david jarvis]

I have a logout page that sends this cookie

setcookie("membership")

So that "membership" shoud be empty.  However, if you login so that the cookie 
membership is created, and then try to logout without restarting the browser, it wont 
delete the cookie.  But if you restart the browser and try to logout, it will work fine

any ideas?

-David