$update=mysql_query("UPDATE `online`
SET `login`='".$user_login."',
`sid`='".session_id()."',
`ip`='".$_SERVER["REMOTE_ADDR"]."',
`agent`='".$_SERVER['HTTP_USER_AGENT']."',
`self`='".$_SERVER['REQUEST_URI']."',
`host`=`host`+1,
`time`='".time()."' WHERE `time` > ".(time()-300)." || `ip`='".$_SERVER["REMOTE_ADDR"]."'");
if(!$update) { mysql_query("INSERT INTO `online`
SET `login`='".$user_login."',
`sid`='".session_id()."',
`ip`='".$_SERVER["REMOTE_ADDR"]."',
`agent`='".$_SERVER['HTTP_USER_AGENT']."',
`self`='".$_SERVER['REQUEST_URI']."',
`host`=`host`+1,
`time`='".time()."'"); }