var currentDate = new Date(); var currentYear = 1900 + currentDate.getYear();
    var dailyMS = 24*60*60*1000;
    var arrivalDate = new Date(currentDate.getTime());
    var departureDate = new Date(currentDate.getTime() + 1*dailyMS);
    var arrivalYear = 1900+arrivalDate.getYear(); var arrivalMonth = 1+arrivalDate.getMonth(); var arrivalDay = arrivalDate.getDate();
    var departureYear = 1900+departureDate.getYear(); var departureMonth = 1+departureDate.getMonth(); var departureDay = departureDate.getDate();
    var a=document.frm;
    if ((a.checkin_monthday.selectedIndex == 0) && (a.checkin_month.selectedIndex == 0) && (a.checkin_year.selectedIndex == 0) &&
        (a.checkout_monthday.selectedIndex == 0) && (a.checkout_month.selectedIndex == 0) && (a.checkout_year.selectedIndex == 0)){
        a.checkin_monthday.options[arrivalDay-1].selected = true;
        a.checkin_month.options[arrivalMonth-1].selected = true;
        a.checkin_year.options[arrivalYear-currentYear].selected = true;
        a.checkout_monthday.options[departureDay-1].selected = true;
        a.checkout_month.options[departureMonth-1].selected = true;
        a.checkout_year.options[departureYear-currentYear].selected = true;
    }