Deleting cookies in IE55

I am trying to delete a cookie in IE55 -> without success ; here is the code

To set the cookie (that works):
/*

$time = mktime()+3600;
$date = date("l, d-M-y H:i:s", ($time));
setcookie("Cookie","$user_id:$md5pw","$date GMT","/");

To delete the cookie I use the following:
(doesn't work)
/
setcookie("Cookie");
/

All comments are welcome!
Thx
Luc

Try this instead:

setcookie("Cookie", "", 0);

Hi Martin, followed your suggestion, but problem remains!

Martin wrote:

Try this instead:

setcookie("Cookie", "", 0);

This seems to work in both IE as NS

$time = mktime()-3600;
$date = date("l, d-M-y H:i:s", ($time));
setcookie("Cookie","","$date GMT","/");

Thanx anyway for your help!