marekkalnik

var formHandling = function(formSelector) {
    var onFormSubmit, onButtonClick, onQuantityChange;

    jQuery(formSelector).bind('submit', onFormSubmit).end()
        .find('button').bind('click', onButtonClick).end()
        .find('input[name="quantity"]').bind('change', onQuantityChange);

    onFormSubmit = function() { ... };
    onButtonClick = function() { ... };
    onQuantityChange = function() { ... };