function calendar(id, sess, feld) 
{
	cal = window.open("calendar.php?itemID="+id+"&"+sessionname+"="+sess+"&von="+feld,"Calendar", "width=220,height=217,scrollbars=no,resizable=no");
  calstat = 1;
}
function calzu()
{
  if (calstat==1) {
    if (cal.closed==false)
    {
       cal.close();
    }
  }
}
var calstat = 0;