Simple example using jQuery:
CSS
.content {
display: hidden;
}
HTML
<h2>My FAQ</h2>
<a class="faqlink" href="#">Link 1</a>
<div class="content">lorem ipsum</div>
<a class="faqlink" href="#">Link 2</a>
<div class="content">lorem ipsum</div>
<a class="faqlink" href="#">Link 3</a>
<div class="content">lorem ipsum</div>
Javascript/jQuery
$(document).ready(function(){
$('.faqlink').click(function(){
$('.content').hide();
$(this).next('.content').show();
});
});