function elementContains(elmOuter, elmInner){
  while (elmInner && elmInner != elmOuter)  { elmInner = elmInner.parentNode;}
  if (elmInner == elmOuter) { return true;}
  return false;
}

function getPageXY(elm){
  var point = { x: 0, y: 0 };
  while (elm) {
    point.x += elm.offsetLeft;
    point.y += elm.offsetTop;
    elm = elm.offsetParent;
  }
  return point;
}

function setPageXY(elm, x, y){
  var parentXY = {x: 0, y: 0 };
  if (elm.offsetParent){parentXY = getPageXY(elm.offsetParent); }
  elm.style.left = (x - parentXY.x) + 'px';
  elm.style.top  = (y - parentXY.y) + 'px';
}