var mouseX=0;
var mouseY=0;
// detect mouse moves:
var IE=document.all?true:false
if (!IE)document.captureEvents(Event.MOUSEMOVE)
document.onmousemove = getMouseXY;
// Main function to retrieve mouse x-y pos.s
function getMouseXY(e) {
	if (IE) { // grab the x-y pos.s if browser is IE
		mouseX=event.clientX+document.body.scrollLeft;
		mouseY=event.clientY+document.body.scrollTop;
	} else {  // grab the x-y pos.s if browser is NS
		mouseX=e.pageX;
		mouseY=e.pageY;
	}  
	// catch possible negative values in NS4
	if (mouseX<0){mouseX=0}
	if (mouseY<0){mouseY=0}
}