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$query1 = "SELECT
          sessions.session_user_id,
          sessions.session_lastaction,
          sessions.session_location,
          users.user_name
          FROM users,sessions
          WHERE users.user_id = sessions.session_user_id
          ORDER BY users.user_name DESC,sessions.session_lastaction DESC";

while ($row = mysql_fetch_array($result))
{
     $query2 = "SELECT
              images.image_id,
              Profil_Bild.image_id,
              images.image_thumb_file,
              images.cat_id
              FROM Profil_Bild, images
              WHERE Profil_Bild.user_id = ".$row[session_user_id]."
              AND images.image_id = Profil_Bild.image_id
              ORDER BY rand()
              LIMIT 0,2";

   // Abfrage und Ausgaben
}