function prepareValues(){
		var checkinDay = document.getElementById('checkin_day').value;
		var checkinMonth = document.getElementById('checkin_month').value;
		var checkinYear = document.getElementById('checkin_year').value;
		var checkoutDay = document.getElementById('checkout_day').value;
		var checkoutMonth = document.getElementById('checkout_month').value;
		var checkoutYear = document.getElementById('checkout_year').value;

		var newFormat = checkinYear + '-' + checkinMonth + '-' + checkinDay;
		document.getElementById('checkin').value = newFormat;

		var checkout = Date.UTC(checkoutYear,checkoutMonth,checkoutDay);
		var checkin = Date.UTC(checkinYear,checkinMonth,checkinDay);
		var diff = checkout - checkin;

		if (diff > 0) {
			diff_in_days = diff / 1000 / 60 / 60 / 24;
			document.getElementById('interval').value = diff_in_days;
		}
		

		
		return true;
	}