<div id="header" style="background: #555; text-align: center; width: 200px; height: 30px; font-weight: bold; color: #fff; cursor: pointer;" onclick="$('#block').slideToggle();">Заголовок</div>
<div id="block" style="width: 198px; height: auto; border: 1px dashed #555;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diem nonummy nibh euismod tincidunt ut lacreet dolore magna aliguam erat volutpat.</div>