function show(menu) {
    document.getElementById(menu).style.visibility = 'visible';
    if ((document.getElementById('active').value != '') && (document.getElementById('active').value != menu)) {
       hide(document.getElementById('active').value)
    }
    document.getElementById('active').value = menu
  }

  function hide(menu) {
   if (menu != '') {
    document.getElementById(menu).style.visibility = 'hidden';
   }
  }

  function openCalendar(FormElement){
    var calendarwindow;
    url = "calendar.html?formname=frm_reservation&formelement=" + FormElement;
    calendarwindow = window.open(url,"thewindow","toolbar=no,LEFT=700,TOP=400,WIDTH=170,HEIGHT=150,status=yes,scrollbars=no,resize=no,menubar=no");
    calendarwindow.focus();
  }

  function default_date() {
    var aMonth = ["January","February","March","April","May","June","July","August","September","October","November","December"];
    var today = new Date();
    var year = today.getYear();
    if(year<1000) year+=1900;
    var todayStr =  today.getDate() + " " + aMonth[today.getMonth()] + ", " + year;
    document.frm_reservation.DateIn.value = todayStr;
    document.frm_reservation.DateIn.value = todayStr;
  }