$t_hasher = new PasswordHash(10, TRUE);
$jpassword = $t_hasher->HashPassword($rsnew["password"]);

$mysql = "SELECT password FROM jos_users WHERE username = '".$usr."'";
   $t_hasher = new PasswordHash(10, TRUE);
   if ($t_hasher->CheckPassword($pwd, $mydb->get_var($mysql))) {
      return TRUE;
          .........