// ACCORDION
$('.accordion .answer').hide(); // hide all
$('.accordion .question').click(function(){
        $('.accordion .answer').slideUp(); // hide all open
        $(this).addClass('active').next().slideDown(); // show the anwser
        return false;
});

HTML:

<dl class="accordion">
    <dt class="question">question</dt>
    <dd class="answer">answer</dd>
    <dt class="question">question</dt>
    <dd class="answer">answer</dd>
</dl>

... works, but

• the 'active' class is removed from inactive question elements and
• atleast one of the answer remains open, all answers should be able to close.

Thanks!