Users Browsing this Thread problem

this is the code i made in showthread.php, right before the [high]dooutput()[/high]:

PHP Code:

// Get users browsing this thread
if ($showforumusers) {
  $threaddatecut = $ourtimenow - $cookietimeout;
  $threadbrowsers = '';
  $threadcoma = '';
  $threadusers = $DB_site->query("SELECT username, invisible, userid
                                  FROM user
                                  WHERE inforum = $thread[threadid]
                                  AND lastactivity > $threaddatecut
                                  AND lastvisit <> lastactivity");
  while ($threaduser = $DB_site->fetch_array($threadusers)) {
    if ((!$threaduser['invisible'] or $bbuserinfo['usergroupid'] == 6) and $bbuserinfo['userid'] != $threaduser['userid']) {
      $loggeduserid = $threaduser['userid'];
      $loggedusername = $threaduser['username'];
      if ($threaduser['invisible'] == 1) {
        $invisibleuser = '*';
      } else {
        $invisibleuser = '';
      }
      eval("\$threadbrowsers .= \"".$threadcoma.gettemplate('showthread_loggedinuser')."\";");
      $threadcoma = ', ';
    }
  }

  if ((!$bbuserinfo['invisible'] or $bbuserinfo['usergroupid'] == 6) and $bbuserinfo['userid'] <> 0) {
    $loggeduserid = $bbuserinfo['userid'];
    $loggedusername = $bbuserinfo['username'];
    if ($bbuserinfo['invisible'] == 1) {
      $invisibleuser = '*';
    } else {
      $invisibleuser = '';
    }
    eval("\$threadbrowsers .= \"".$threadcoma.gettemplate('showthread_loggedinuser')."\";");
  }
  if ($threadbrowsers) {
    eval("\$loggedusers .= \"".gettemplate('showthread_loggedinusers')."\";");
  }
} 

for some reason, it will grab only one user at the time. is all in the query my bug. can you help me to understand where resides the problem?

[TECK]

i also tried this:
i replaced:

PHP Code:

WHERE inforum = $thread[threadid] 

with

PHP Code:

WHERE inforum = $thread[forumid] 

but now it shows all the users frowsing the forum, not the thread. any help will be apreciated.

UPDATE: Unfortunatelly, i dont have a live website to test my hacks. i only have a localhost setup where i run all my tests, with no users but me that can connect and browse. that's why i always had problems releasing proper hacks.
i will signup with a host in about one month or two and go live with a website. in this way there should be no more problems. for now, i would like to solve this issue mentioned above. thank you

UPDATE 2: ather looking at firefly's code, i realised how close i was to make it work this hack.
as you say firefly, life aint fair. my failure to make this hack made me learn one new thing. thanks alot.