function calendarPopup() {

  // assigning methods
  this.popup = calendar;
  this.popupToday = calendar;

}

function calendarMonth (thisMonth) {

  var popwindow = window.open(
      thisMonth,
      'calendar', 'width=600,height=600,status=no,resizable=no,top=100,left=400,dependent=yes,alwaysRaised=yes,menubar=no'
    );
  popwindow.opener = window;
  popwindow.focus();

}

function calendar () {

  var now = new Date();
  var thisMonth = "/BRRoot/calAll.php?month="  + (now.getMonth()+1) + "&year=" + now.getFullYear();
  var popwindow = window.open(
      thisMonth,
      'calendar', 'width=850,height=700,status=no,resizable=yes,top=200,left=200,dependent=yes,alwaysRaised=yes,menubar=no,toolbar=yes,scrollbars=yes'
    );
  popwindow.opener = window;
  popwindow.focus();

}