var posx = 0;
var posy = 0;

var IE = document.all?true:false;
if (!IE) document.captureEvents(Event.MOUSEMOVE);
document.onmousemove = where_mouse;

function where_mouse(e) {
  if (!e) var e = window.event;
  if (e.pageX || e.pageY) 	{
    posx = e.pageX;
    posy = e.pageY;
  }
  else if (e.clientX || e.clientY) 	{
    posx = e.clientX + document.body.scrollLeft
      + document.documentElement.scrollLeft;
    posy = e.clientY + document.body.scrollTop
      + document.documentElement.scrollTop;
  }
}