// Detect if the browser is IE or not.
// If it is not IE, we assume that the browser is NS.
var IE = document.all?true:false;
 
// If NS -- that is, !IE -- 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.documentElement.scrollLeft;
    tempY = event.clientY + document.documentElement.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}
  return true
}