Two different form actions depending of radio button

ChoosAction

jQuery(document).ready(function($) {
    var form = $('form[name="pledgeform"]'),
        radio = $('input[name="pledge"]'),
        choice = '';

    radio.change(function(e) {
        choice = this.value;

        if (choice === 'yes') {
            form.attr('action', 'payment.php');
        } else {
            form.attr('action', 'flat_payment.php');
        }
    });
});