function offsetCoords()
{
    var offsetInfo = ""
    offsetInfo = "The x coordinate is: " + window.event.offsetX + "\r"
    offsetInfo += "The y coordinate is: " + window.event.offsetY + "\r"
    alert(offsetInfo);
}
</SCRIPT>
</HEAD>
<BODY onmousemove="window.status = 'X=' + window.event.offsetX + 
    ' Y=' + window.event.offsetY" ondblclick="offsetCoords()">
:
<DIV onclick="offsetCoords();" . . . position:absolute; top:200;
    left:300;">
:
</DIV>