cannot remove cookies

Hello. I'm using 2 cookies to control some user environmente. every time the user logs in, the cookie is set, but when i try to change the value of that cookie, deleting it firts and then setting a new one with another value, when i print the value of that cookie the value is never the new one, but always the firts. im setting the cookie with: setcookie ("cookie_name",cookie_value,time()+time-to-expiration); when deleting it, i do setcookie ("cookie_name"); or setcookie ("cookie_name","",time()-time-to-expiration); but it never works the browser im testing it is firefox (linux) but in IE is not working either... PHP version is PHP-5.0.3 Apache version is Apache-2.0.52 Cheers Bruno Santos -- Say no to software patents www.nosoftwarepatents.com/ -- bvsantos@hal.min-saude.pt -- Divisao de Informatica informatica@hal.min-saude.pt Tel: +351 272 000 155 Fax: +351 272 000 257 -- Hospital Amato Lusitano geral@hal.min-saude.pt Tel: +351 272 000 272 Fax: +351 272 000 257