Get Mouse Event Position

get-mouse-event-position.js

function(e) {
  if(!e) var e = window.event;
  
  var posx = 0;
  var posy = 0;
  
  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;
  }
  
  return {x: posx, y: posy};
}