в папкe blocks создаем файл block-users_today.php с содержимым

<?php

if (!defined('BLOCK_FILE')) {
header("Location: ../index.php");
exit;
}

 

//visited today 

$res = mysql_query("SELECT id,gender, username, donor, class, warned FROM users WHERE UNIX_TIMESTAMP(" . get_dt_num() . ") - UNIX_TIMESTAMP(last_access) < UNIX_TIMESTAMP(" . get_dt_num() . ") - UNIX_TIMESTAMP(" .date("Ymd000000"). ") ORDER BY username") or sqlerr(__FILE__, __LINE__);   
while ($arr = mysql_fetch_assoc($res))   
{   

    if ($todayactive)   
        $todayactive .= ", ";   

    if ($CURUSER) {   
        $todayactive .= "<a href=userdetails.php?id=" . $arr["id"] . ">".get_user_class_color($arr["class"], $arr["username"])."</a></a>";   
    } else {   
        $todayactive .= "<a href=userdetails.php?id=" . $arr["id"] . ">".get_user_class_color($arr["class"], $arr["username"])."</a></a>";   
    }   
    $donator = $arr["donor"] == "yes";   
    if ($donator) {   
        $todayactive .= "<img alt=\"спонсор\" src=\"pic/star.gif\">";   

    }   
    $warned = $arr["warned"] == "yes";   
    if ($warned) {   
        $todayactive .= "<img alt=\"предупрежден\" src=\"pic/warned.gif\">";   
    }   

    $usersactivetoday++;   
}   

$content .= "<center> 
<table class=\"main\" cellspacing=\"0\" cellpadding=\"5\" border=\"0\" width=\"100%\"><tr><td class=\"embedded\">" 
."<b><font color=red>".$usersactivetoday."</font> пользователей посетило трекер сегодня:</b><hr>" 
."<div align='left'>".$todayactive."</div><hr></td></tr></table></center>"; 
//end visited today 

?>

И запускаем в админки