<?
if (isset($user))mysql_query("DELETE FROM `chat_who` WHERE `id_user` = '".mysql_real_escape_string($user[id])."'");
mysql_query("DELETE FROM `chat_who` WHERE `time` < '".mysql_real_escape_string($time-120)."'");
echo mysql_result(mysql_query("SELECT COUNT(*) FROM `chat_who`"),0);
?>