function oeffnen(left, top, id) {
  document.getElementById(id).style.left=left+"px";
  document.getElementById(id).style.top=top+"px";
  document.getElementById(id).style.visibility='visible';
}

function schliessen(id) {
  document.getElementById(id).style.visibility='hidden';
}

function getXPos(obj) {
  leftGes = obj.offsetLeft;
  while (obj.offsetParent) {
    obj = obj.offsetParent;
    leftGes = leftGes + obj.offsetLeft;
  }
  return leftGes;
}

function getYPos(obj) {
  topGes = obj.offsetTop;
  while (obj.offsetParent) {
    obj = obj.offsetParent;
    topGes = topGes + obj.offsetTop;
  }
  return topGes;
}