$(document).ready(function () {
    /* This code is executed after the DOM has been completely loaded */

    /* Changing thedefault easing effect - will affect the slideUp/slideDown methods: */
    $.easing.def = "easeOutBounce";

    /* Binding a click event handler to the links: */
    $('li.button a').click(function (e) {

        /* Finding the drop down list that corresponds to the current section: */
        var dropDown = $(this).parent().next();

        /* Closing all other drop down sections, except the current one */
        $('.dropdown').not(dropDown).slideUp('fast');
        dropDown.slideToggle('fast');

        /* Preventing the default event (which would be to navigate the browser to the link's address) */
        e.preventDefault();
    })

});