heres the code from the popup, the bits in bold are what I added, did I do it right? will it cause much of a slowdown?
$isadmin = 0;
echo ''._WHOSONLINE.' ';
$start = isset($HTTP_GET_VARS['start']) ? intval($HTTP_GET_VARS['start']) : 0;
$online_handler =& xoops_gethandler('online');
$online_total =& $online_handler->getCount();
$limit = ($online_total > 20) ? 20 : $online_total;
$criteria = new CriteriaCompo();
$criteria->setLimit($limit);
$criteria->setStart($start);
$onlines =& $online_handler->getAll($criteria);
$count = count($onlines);
$module_handler =& xoops_gethandler('module');
$modules =& $module_handler->getList(new Criteria('isactive', 1));
for ($i = 0; $i < $count; $i++) {
if ($onlines[$i]['online_uid'] == 0) {
$onlineUsers[$i]['user'] = '';
} else {
$onlineUsers[$i]['user'] =& new XoopsUser($onlines[$i]['online_uid']);
}
$onlineUsers[$i]['ip'] = $onlines[$i]['online_ip'];
[b]$onlineusers[$i]['host'] = gethostbyaddr($onlineUsers[$i]['ip']);[/b]
$onlineUsers[$i]['updated'] = $onlines[$i]['online_updated'];
$onlineUsers[$i]['module'] = ($onlines[$i]['online_module'] > 0) ? $modules[$onlines[$i]['online_module']] : '';
}
$isadmin = ($xoopsUser && $xoopsUser->isAdmin()) ? 1 : 0;
$class = 'even';
for ($i = 0; $i < $count; $i++) {
$class = ($class == 'odd') ? 'even' : 'odd';
echo '.$class.'">';
if (is_object($onlineUsers[$i]['user'])) {
$avatar = $onlineUsers[$i]['user']->getVar('user_avatar') ? '
.XOOPS_UPLOAD_URL.'/'.$onlineUsers[$i]['user']->getVar('user_avatar').'" alt="" />' : ' ';
echo ''.$avatar." javascript:window.opener.location='".XOOPS_URL."/userinfo.php?uid=".$onlineUsers[$i]['user']->getVar('uid')."';window.close();">".$onlineUsers[$i]['user']->getVar('uname')."";
} else {
echo ' '.$xoopsConfig['anonymous'];
}
if ($isadmin == 1) {
echo '
('.$onlineUsers[$i]['ip'].')';
[b]echo '
('.$onlineusers[$i]['host'].')';[/b]
}
echo ' '.$onlineUsers[$i]['module'].' ';
}
echo '
';
if ($online_total > 20) {
include_once XOOPS_ROOT_PATH.'/class/pagenav.php';
$nav = new XoopsPageNav($online_total, 20, $start, 'start', 'action=showpopups&type=online');
echo ''.$nav->renderNav().'';
}
break; 

**edit 2**