/*	Wenn Abhol-Station gewaehlt wurde, wird die gleiche 
	Station als Abgabe-Station vorselektiert */
function changeReturn(pickupId, returnId) {
	value = document.getElementById(pickupId).selectedIndex;
	document.getElementById(returnId).selectedIndex = value;
}


function changeReturnDate(pickupDateDayId, pickupDateMonthId, pickupDateYearId, returnDateDayId, returnDateMonthId, returnDateYearId) {
	
	var diffDays = 3;
	
	var selectDay 	= document.getElementById(pickupDateDayId).selectedIndex;
	var selectMonth = document.getElementById(pickupDateMonthId).selectedIndex;
	var selectYear 	= document.getElementById(pickupDateYearId).selectedIndex;
	
	var pickupDay 	= document.getElementById(pickupDateDayId).options[selectDay].value;
	var pickupMonth = document.getElementById(pickupDateMonthId).options[selectMonth].value;
	var pickupYear 	= document.getElementById(pickupDateYearId).options[selectYear].value;
	
	// alert(pickupDay + "." + pickupMonth + "." + pickupYear);
	
	var time = new Date(pickupYear, pickupMonth - 1, pickupDay);
	
	// alert(time.getDate() + "." + time.getMonth() + "." + time.getFullYear());
	
	var returnDate = time.getTime() + (diffDays * 24 * 60 * 60 * 1000);
	
	// alert(returnDate);
	
	time.setTime(returnDate);
		
	var returnDay 	= time.getDate();
	var returnMonth = time.getMonth() + 1;
	var returnYear 	= time.getFullYear();
	
	// alert(returnDay + "." + returnMonth + "." + returnYear);
	
	for (i = 0; i < document.getElementById(returnDateDayId).length; ++i) {
		if (document.getElementById(returnDateDayId).options[i].value == returnDay) {
			document.getElementById(returnDateDayId).selectedIndex = i;
		}
	}
	for (i = 0; i < document.getElementById(returnDateMonthId).length; ++i) {
		if (document.getElementById(returnDateMonthId).options[i].value == returnMonth) {
			document.getElementById(returnDateMonthId).selectedIndex = i;
		}
	}
	for (i = 0; i < document.getElementById(returnDateYearId).length; ++i) {
		if (document.getElementById(returnDateYearId).options[i].value == returnYear) {
			document.getElementById(returnDateYearId).selectedIndex = i;
		}
	}
	
}