var attach_exapnder_links = function(){
    $('ul.expander > li h3').click(function(){
        $(this).next('div:visible').slideUp()
               .end()
               .next('div:hidden').slideDown()
               .end()
               .parent('li').toggleClass('expanded');
        return false;
    });

};

var hide_expander_inners = function(){
    $('ul.expander div').hide();
};

$(function(){
    hide_expander_inners();
    attach_exapnder_links()
});