How can you get the X Co-ordinates Y Co-ordinates values during the Mouse Movement?

The X and y co-ordinates during the mouse movement can be obtained by the following codings.

<html>
	<body>
		<form name='Show'>
			<b>X Co-Ordinate Value:</b><input type="text" name="X" value="0" size="4"> <br>
                        <b>Y Co-Ordinate Value:</b><input type="text" name="Y" value="0" size="4"> <br>
		</form>
		<script language='Javascript'>
		<!--

			// Detect if the browser is IE or not.
			// If the browser is not IE, we assume that the browser is NS.
			var IE = document.all?true:false

			// If NetScape then set up for mouse capture
			if (!IE) document.captureEvents(Event.MOUSEMOVE)

			// Set-up to use getMouseXY function onMouseMove
			document.onmousemove = getMouseXY;

			// Temporary variables to hold mouse x-y pos.s
			var tempX = 0
			var tempY = 0

			// Main function to retrieve mouse x-y pos.s

			function getMouseXY(e) 
			{
  				if (IE) { // grab the x-y pos.s if browser is IE
				tempX = event.clientX + document.body.scrollLeft;
				tempY = event.clientY + document.body.scrollTop;
			}
			else
			{
				  // grab the x-y pos.s if browser is NS
		  		  tempX = e.pageX;
   				  tempY = e.pageY;
  			}  
			// catch possible negative values in NS4
			if (tempX < 0){tempX = 0}
			if (tempY < 0){tempY = 0}  

			// show the position values in the form named Show
			// in the text fields named MouseX and MouseY
			document.Show.X.value = tempX;
			document.Show.Y.value = tempY;
			return true;
		}
		//-->
		</script>
	</body>
</html>