Cookie-question?

Hi there! Look at following code below, and please give me a clue why this cookie-thing doesn't work? $IDJoke is set before and is an ID from a row in a db It seems to work a while, but is there a limit for the expire-parameter? /G http://www.varupiraten.se/ //Get cookie from users computer for current joke to tell if user is allowed to vote or not! // $cookieJoke = $HTTP_COOKIE_VARS["$IDJoke"]; if ($cookieJoke == 'voted') {$showVoteValues ='N';$userVote = 'N';} //User wants to vote? // if ($voteNow == 'Y' AND $userVote == 'Y' AND $cookieJoke != 'voted') {

           $showVoteValues = 'N'; //Don't show values directly after vote...

           //Save IDJoke to a cookie with the value - voted to users computer
           setcookie("$IDJoke", 'voted', time()+60*60*24*30*12*100);  /* expires in about 100 years*/

//END User wants to vote // }