accordeon klick and close again

how can i make that accordeons close again if i click on it again?

http://antrimongroup.cel-media.ch/hauptnavigation/dienstleistungen/
http://awesomescreenshot.com/09860s1k3f

thanks for reaply
rainer

ok ... i wrote this code in to function.js

$(function() {

    var active = $('a[data-toggle="tab"]').parents('.active').length;
    var tabClicked = false;

    // Closes current active tab (toggle and pane):
    var close = function() {
        $('a[data-toggle="tab"]').parent().removeClass('active');
        $('.tab-pane.active').removeClass('active');
        active = null;
    }

    // Closing active tab when clicking on toggle:
    $('[data-toggle=tab]').click(function(){
        if ($(this).parent().hasClass('active')){
            $($(this).attr("href")).toggleClass('active');
            active = null;
        } else {
            tabClicked = true;
            active = this;
        }
    });

    // Closing active tab when clicking outside tab context (toggle and pane):
    $(document).on('click.bs.tab.data-api', function(event) {
        if(active && !tabClicked && !$(event.target).closest('.tab-pane.active').length) {
            close();
        }

        tabClicked = false;
    });

    // Closing active tab on ESC key release:
    $(document).keyup(function(e){
        if(active && e.keyCode === 27) { // ESC
            close();
        }
    });
});

just if someone later ask for it