$cost = str_replace($user->decimal_mark, '.', $cost);
$sql = "update tt_predefined_expenses set name = ".$mdb2->quote($name).", cost = ".$mdb2->quote($cost).
$cost = str_replace($user->decimal_mark, '.', $cost);
$sql = "update tt_predefined_expenses set name = ".$mdb2->quote($name).", cost = ".$mdb2->quote($cost).