Предлагаю так:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
.container {border:1px solid red;width:100px;height:50px}
.thead {border:1px solid green}
.alt1 {border:1px solid blue}
</style>
<script type="text/javascript" src="jquery-1.2.6.js" ></script>
<script type="text/javascript">
<!--
$(document).ready(function(){
$("span.thead").click(function () {
$(this).siblings('div.alt1').slideToggle("slow")
});
});
//-->
</script>
</head>
<body>
<div class="container"><span class="thead">H E A D</span><div class="alt1">Bla bla bla...</div></div>
<div class="container"><span class="thead">H E A D</span><div class="alt1">Bla bla bla...</div></div>
<div class="container"><span class="thead">H E A D</span><div class="alt1">Bla bla bla...</div></div>
</body>
</html>