Code:
<html>
<head>
<script language="JavaScript"><!--
if (document.layers) document.captureEvents(Event.MOUSEMOVE);
document.onmousemove=mtrack;

function mtrack(e) {
   var text = 'Coordinates: ';
   if (document.layers) text += e.pageX + ',' + e.pageY
   else text += event.x + ',' + event.y;
   window.defaultStatus = text;
}
//--></script>
</head>
<body>
Move the mouse and see the status change
</body>
</html>