Something

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
* {
	font-size: 14px;
	font-style: verdana;
}
dt {cursor:pointer}
dd {display:none}
</style>
<script type="text/javascript">
window.onload = function() {
	var vdl = document.getElementById('leftNews');
	var vdt = vdl.getElementsByTagName('dt'); 

	for (var i = 0; i < vdt.length; i++) {
		vdt[i].onclick = function() {
			alert(i);
		}
	}
}
</script>
</head>
<body>
<dl id="leftNews">
<dt>Lorem Ipsum dolor est</dt>
<dd>Hau bau bau bau</dd>

<dt class="selected">Lorem Ipsum dolor est</dt>
<dd>Hau bau bau bau</dd>

<dt>Lorem Ipsum dolor est</dt>
<dd>Hau bau bau bau</dd>
</dl>
</body>
</html>