当鼠标点到一个连接上，能否知道此链接的坐标left,top?怎么做？

<a href="#" onclick="mm(this)">link</a>
<SCRIPT LANGUAGE="JavaScript">
function getAbsPoint(e)
{
  var x = e.offsetLeft, y = e.offsetTop;
  while(e=e.offsetParent){x += e.offsetLeft; y += e.offsetTop;}
  return {"x": x, "y": y};
}
function mm(e)
{
  var xy = getAbsPoint(e);
  alert("left = "+ xy.x +"\r\ntop = "+ xy.y);
}
</SCRIPT>