Witam, ma zapytanie ajaxowe (jquyery)

[HTML] pobierz, plaintext 
        $.ajax({type: 'POST',
                url: 'index.php?action=ajax&m=login',
                data: { login: login,
                        password: password,
                        class: class },
                success: function( response )
                {
                }
               });
[HTML] pobierz, plaintext 

i parametr response ma wartosc

[XML] pobierz, plaintext 
<?xml version="1.0" encoding="utf-8"?>
<success>
TRUE
</success>
[XML] pobierz, plaintext 

Jak teraz za pomoca jquery z parametru response miec dostep do tag success?