var calendarDateForm;
var calendarDateField;

function calendar(dateForm, dateField) {
  var calWin = window.open("calendar.html", "_calendar", "width=200,height=200,status=no,toolbar=no,menubar=no,location=no,top=400,left=250");
  calWin.screenX = 400;
  calWin.screenY = 250;
  calWin.opener = this;
  calendarDateForm = dateForm;
  calendarDateField = dateField;
}