OS,host, IP,browser can already be drawn without javascript , even last login...something like this maybe?
global $user_info;
echo '<div class="smalltext"><b>Browser:</b> '.$_SERVER['HTTP_USER_AGENT'].'<br />';
echo '<b>IP:</b> '.$user_info['ip'].'<br />';
echo '<b>Last visit:</b> '.timeformat($user_info['last_login']).'</div>';
In a php-block of course.
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