Cookie leeg maken na tijd is afgelopen.

<?
if(isset($_COOKIE['tijd'])){
					 $query = mysql_query("SELECT * FROM `leden` WHERE bouw > NOW() 
                    AND `id` ='".mysql_real_escape_string($_SESSION['log_id'])."'")or die(mysql_error());
                     if(mysql_num_rows($query) == 0){
					 unset($_SESSION['pro_id'], $_SESSION['soort'], $_SESSION['level']);
					   }
					 } else {
					 $_SESSION['level'] = $_SESSION['level'] - 1;
					 header('Refresh: 60; URL=index.php?p=levels');
					 echo'<table width="100%" border="0" align="center" cellpadding="3" cellspacing="1" bgcolor="CFAF76">
                     <tr>
                     <td width="100%" align="center" bgcolor="#69292D"><img src="img/stop.png" heigth="12" width="13" /> <a href="index.php?php?p=stop#'.$_SESSION['pro_id'].'" class="contentlinks"><font color="white">De upgrade is over <b>'.date('i:s', $_COOKIE['tijd'] - time() ).'</b> min 100% voltooid naar';?> (Level <?=ucfirst($_SESSION['level'])?>) <?echo'</font></a></td>
                     </tr>
                     </table>'. $_SESSION['soort'];
					  }
?>

<?
if(isset($_COOKIE['tijd'])){
					 $query = mysql_query("SELECT * FROM `leden` WHERE bouw > NOW() 
                    AND `id` ='".mysql_real_escape_string($_SESSION['log_id'])."'")or die(mysql_error());
                     if(mysql_num_rows($query) == 0){
					 unset($_SESSION['pro_id'], $_SESSION['soort'], $_SESSION['level']);
					   }
					 } else {
					 $_SESSION['level'] = $_SESSION['level'] - 1;
					 header('Refresh: 60; URL=index.php?p=levels');
					 echo'<table width="100%" border="0" align="center" cellpadding="3" cellspacing="1" bgcolor="CFAF76">
                     <tr>
                     <td width="100%" align="center" bgcolor="#69292D"><img src="img/stop.png" heigth="12" width="13" /> <a href="index.php?php?p=stop#'.$_SESSION['pro_id'].'" class="contentlinks"><font color="white">De upgrade is over <b>'.date('i:s', $_COOKIE['tijd'] - time() ).'</b> min 100% voltooid naar';?> (Level <?=ucfirst($_SESSION['level'])?>) <?echo'</font></a></td>
                     </tr>
                     </table>'. $_SESSION['soort'];
					  }
?>

setcookie("tijd", " ");/* Let op de spatie tussen " " */

setcookie("tijd", " ");/* Let op de spatie tussen " " */

$afteller = ($check['tijd'] + ($check['wachtijd'] * 60)) - time();

$afteller = ($check['tijd'] + ($check['wachtijd'] * 60)) - time();