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.checkout_monthday.selectedIndex == 0)){
	a.checkin_monthday.options[arrivalDay-1].selected = true;
	a.checkout_monthday.options[departureDay-1].selected = true;
}

	var frm = document.getElementById('frm');
			// create date object from checkin values
			// set date to 12:00 to avoid problems with one
			// date being wintertime and the other summertime
	var my = frm['b_checkin_month'].value.split("-");
	   var ci = new Date (my[0], my[1]-1, frm['b_checkin_day'].value, 12, 0, 0, 0);

	// create date object from checkout values
	 my = frm['b_checkout_month'].value.split("-");
	 var co = new Date (my[0], my[1]-1, frm['b_checkout_day'].value, 12, 0, 0, 0);
	if (ci >= co){
		co.setTime(ci.getTime() + 1000 * 60 * 60 * 24);
			frm['b_checkout_day'].value =  co.getDate();
		var com = co.getMonth()+1;
			frm['b_checkout_month'].value = co.getFullYear() + "-" + com;
}