probabilmente intendi usando le proprieta' dell' oggetto event
cmq questo mi risulta funzionare
codice:
<html>
<head>
<title>coordinate assolute elemento in flusso html</title>
<style type="text/css">
<!--
table {
	border-collapse:collapse;
	height:2000px;
	width:800px;
}
td {
	height:500px;
	text-align:center;
}
-->
</style>
<script language="JavaScript" type="text/javascript">
<!--

function getPageCoords(element){
	var coords = {x: 0, y: 0}; 
	while (element) { 
		coords.x += element.offsetLeft; 
		coords.y += element.offsetTop; 
		element = element.offsetParent; 
	} 
	return coords; 
}

function posizione(idx){
	var p=getPageCoords(document.getElementById(idx));
	alert(p.x+','+p.y);	
}
//-->
</script>
</head>
<body>
<table>
 <tbody>
  <tr>
   <td>
    link 1
   </td>
  </tr>
  <tr>
   <td>
    link 2
   </td>
  </tr>
  <tr>
   <td>
    link 3
   </td>
  </tr>
  <tr>
   <td>
    link 4
   </td>
  </tr>
</tbody>
</table>
</body>
</html>
ciao