var weekdays = new Array( "Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"); 
var monthNames = [ "January","February","March","April","May","June","July","August","September","October","November","December"];
var daysInMonths = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
var daysInMonthsDuringLeapYear = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
var minute = 60 * 1000
var hour = 60 * minute
var day = 24 * hour
var week = day * 7
var beginDate,endDate;
var defaultDepartureOffset = 2;
var maximumDays = 31;
var minBeginDate = cleanDate(new Date());
var maxYear = 2010;	
beginDate= new Date();
endDate = new Date();
endDate.setTime(beginDate.getTime() + defaultDepartureOffset * day);

function window_onload()
{
    adjustDates();
}
function adjustDates()
{
	getDatesFromLists();
	adjustDatesAndNumberOfNights();
	initDayList(document.forms["frm_Searchbox"].lstBeginDay1,beginDate);
	initDayList(document.forms["frm_Searchbox"].lstEndDay1,endDate);
	setDates();
}
//sets departure to arrival date plus num nights selected
function offsetDepartureByNumberOfNights()
{
	var numberOfNights=document.forms["frm_Searchbox"].numberOfNights.options.selectedIndex + 1;
	var newDate = new Date();
	endDate.setTime(beginDate.getTime() + day * numberOfNights);
	setDates();//(document.forms["frm_Searchbox"].lstEndDay1,document.forms["frm_Searchbox"].lstEndMonth,document.forms["frm_Searchbox"].lstEndYear,newDate);
}
function getFullYear(d) {
	var y = d.getYear();
	if (y < 1000) y += 1900;
	return y;
}
function getDatesFromLists()
{
	//get data from lists
	var beginMonth = document.forms["frm_Searchbox"].lstBeginMonth.selectedIndex;
	var endMonth = document.forms["frm_Searchbox"].lstEndMonth.selectedIndex;
	var beginYear = getText(document.forms["frm_Searchbox"].lstBeginYear);
	var endYear = getText(document.forms["frm_Searchbox"].lstEndYear);
	var beginDay = getText(document.forms["frm_Searchbox"].lstBeginDay1);
	var endDay = getText(document.forms["frm_Searchbox"].lstEndDay1);
	beginDate = new Date(beginYear,beginMonth,beginDay);
	endDate = new Date(endYear,endMonth,endDay);
}
function getText(lst)
{
	if(lst!=null && lst.selectedIndex!=null && lst.options[lst.selectedIndex]!=null)
	{
		if(lst.options[lst.selectedIndex]!=null)
			return lst.options[lst.selectedIndex].text;
		else
			alert("list has no option at " +  lst.selectedIndex);
		return "";	
	}
	else 
		return "";	
}
function IsValidBeginDate()
{	
	if(beginDate==null)
		return false;
	else if(isNaN(beginDate.getTime()))
		return false;
	else if(beginDate.getTime() < cleanDate(new Date()).getTime())
	{
		var src=window.event;
		if(src!=null && src.srcElement!=null)
		{
			var lastChange=src.srcElement.name;
			if(src.srcElement.name=="lstBeginMonth")
			{
				beginDate.setYear(beginDate.getYear() + 1);	
			}
			else
				return false;
		}
	}
	else 
		return true;
}
function IsValidEndDate()
{
	if(endDate==null)
		return false;
	else if(isNaN(endDate.getTime()))
		return false;
	else if(endDate.getTime()<=beginDate.getTime())
		return false;
	else if((endDate.getTime()-beginDate.getTime())/ day > maximumDays)
	{
		endDate.setTime(beginDate.getTime()+ (maximumDays-1) * day);
		return true;
	}
	else 
		return true;
}
function resetDates()
{
	if(!IsValidBeginDate())
		beginDate= new Date();
	endDate.setTime(beginDate.getTime()+ getNumberOfNights() * day);
}
function parseDate(dateString)
{
	var re=/(\w+)\/(\w+)\/(\w+)/;
	var values = re.exec(dateString);
	return new Date(parseInt(values[3]),parseInt(values[1])-1,parseInt(values[2]));
}
function validDates()
{
	return (IsValidBeginDate() && IsValidEndDate());
}
function getNumberOfNights()
{
	return document.forms["frm_Searchbox"].numberOfNights.selectedIndex + 1;
}
function setNumberOfNights()
{
	var len = ((endDate.getTime()- beginDate.getTime()) / day)-1;
	while(document.forms["frm_Searchbox"].numberOfNights.options==null || document.forms["frm_Searchbox"].numberOfNights.options.length <=len)
	{
		var count = 0;
		if(document.forms["frm_Searchbox"].numberOfNights.options!=null)
			count=document.forms["frm_Searchbox"].numberOfNights.options.length;
		addToList(document.forms["frm_Searchbox"].numberOfNights,count,count);
	}
	document.forms["frm_Searchbox"].numberOfNights.options[len].selected=true;
}
function adjustDatesAndNumberOfNights()
{
	var minDays = defaultDepartureOffset;
	if(document.forms["frm_Searchbox"].numberOfNights!=null && !isNaN(document.forms["frm_Searchbox"].numberOfNights.value))
		minDays = getNumberOfNights();
	
	if(!validDates())
		resetDates();
	
	var src=window.event;
	if(src!=null && src.srcElement!=null)
	{
		var lastChange=src.srcElement.name;
		if(lastChange.indexOf("lstBegin")==0)
		{
			if(!IsValidBeginDate())
				beginDate= cleanDate(new Date());
			endDate.setTime(beginDate.getTime()+ minDays * day);
			setNumberOfNights();
		}
		else if(lastChange=="lstEndMonth")
		{
			var beginMonth = document.forms["frm_Searchbox"].lstBeginMonth.selectedIndex;
			var endMonth = document.forms["frm_Searchbox"].lstEndMonth.selectedIndex;
			if(!IsValidEndDate())
				endDate.setTime(beginDate.getTime()+ minDays * day);
			else
			{
				if(beginMonth==endMonth)
					endDate.setTime(beginDate.getTime()+ defaultDepartureOffset * day);
				else
					setNumberOfNights();
			}
		}
		else if(lastChange.indexOf("lstEnd")==0)
		{
			if(!IsValidEndDate())
				endDate.setTime(beginDate.getTime()+ minDays * day);
			else
				setNumberOfNights();
		}
		else if(lastChange.indexOf("numberOfNights")==0)
		{
			endDate.setTime(beginDate.getTime()+ getNumberOfNights() * day);
		}
		else
		{
			if(!IsValidBeginDate())
				resetDates();
			else if(!IsValidEndDate())
			{
				endDate.setTime(beginDate.getTime()+ getNumberOfNights() * day);
			}
				
		}
	}
}
function cleanDate(date)
{
	date.setHours(0);
	date.setMinutes(0);
	date.setSeconds(0);
	date.setMilliseconds(0);
	return date;
}
function setDates()
{
	var dat="";
	var dat2="";
	if (navigator.appName == "Netscape" )
	{
		dat+=beginDate.getYear()+1900;
		dat2+=endDate.getYear()+1900;
	}
	else
	{
		dat+=beginDate.getYear();
		dat2+=endDate.getYear();
	}
	setIndexByValue(dat,document.forms["frm_Searchbox"].lstBeginYear);
	setIndexByValue(dat2,document.forms["frm_Searchbox"].lstEndYear);
	setIndex(beginDate.getDate(),document.forms["frm_Searchbox"].lstBeginDay1);
	setIndex(endDate.getDate(),document.forms["frm_Searchbox"].lstEndDay1);
	document.forms["frm_Searchbox"].lstBeginMonth.options[beginDate.getMonth()].selected=true;
	document.forms["frm_Searchbox"].lstEndMonth.options[endDate.getMonth()].selected=true;
	
	if(document.forms["frm_Searchbox"].numberOfNights!=null)
	{
		if(endDate.getTime()>beginDate.getTime())
		{
			var newIndex = (endDate.getTime()-beginDate.getTime())/day;
			while((newIndex-1)>=document.forms["frm_Searchbox"].numberOfNights.options.length)
			newIndex--;
			document.forms["frm_Searchbox"].numberOfNights.options[newIndex-1].selected=true;
		}
		
	}
}
function getNextMonth(monthDate)
{
	var tempDate = new Date(monthDate);
	var monthNo = tempDate.getMonth();
	while(tempDate.getMonth()==monthNo)
	{
		tempDate.setTime(tempDate.getTime() + day);
	}
	return tempDate;
}
function getLastMonth(monthDate)
{
	var tempDate = new Date(monthDate);
	var monthNo = tempDate.getMonth();
	while(tempDate.getMonth()==monthNo)
	{
		tempDate.setTime(tempDate.getTime() - day);
	}
	return tempDate;
}
function getLastDayOfMonth(month)
{
	return monthMax(month-1)
}
function checkMonths()
{
	adjustDates()
    getDatesFromLists()
	initDayListFromMonthAndYear(document.forms["frm_Searchbox"].lstBeginDay1,document.forms["frm_Searchbox"].lstBeginDay1.selectedIndex,document.forms["frm_Searchbox"].lstBeginMonth.selectedIndex-1,arrYear)
    initDayListFromMonthAndYear(document.forms["frm_Searchbox"].lstBeginDay1,document.forms["frm_Searchbox"].lstBeginDay1.selectedIndex,document.forms["frm_Searchbox"].lstBeginMonth.selectedIndex-1,depYear)
    
}
function getDaysInMonth(mtIDx, YrStr)
{
// all the rest have 31
var maxDays=31
// expect Feb. (of course)
if (mtIDx==1)
	{
	if (isLeapYear(YrStr))
		{
		maxDays=29;
		}
	else
		{
		maxDays=28;
		}
	}
// thirty days hath...
if (mtIDx==3 || mtIDx==5 || mtIDx==8 || mtIDx==10)
	{
	maxDays=30;
	}
return maxDays;
}
function initDayListFromMonthAndYear(lst,day,month,year)
{
	var newDate = new Date(month + " 1, " + year)
	lst.options.length = 0
	//lst.options[0]= new Option(" ")
	for(var t = 1;t<= getDaysInMonth(month,year);t++)
	lst.options[t]= new Option(t)
	lst.selectedIndex=day
	
}
function daysInMonth(dt)
{
	var monthNum=dt.getMonth();
	var curMonth=monthNum;
	while(curMonth==monthNum)
	{
		dt.setTime(dt.getTime()+day);
		curMonth=dt.getMonth();
	}
	dt.setTime(dt.getTime()-day);
	return dt.getDate();
}
function initDayList(lst,dateToParse)
{
	var dt = new Date(dateToParse);
	//correct day lists
	lst.options.length = 0
	var totalDays = daysInMonth(dt);
	for(var t = 0;t<= totalDays;t++)
		lst.options[t]= new Option(t);
	lst.options[dt.getDate()].selected = true
	lst.options[0]=null;
}
function initMonthList(lst)
{
	lst.options.length = 0
	lst.options[1]= new Option("Jan")
	lst.options[2]= new Option("Feb")
	lst.options[3]= new Option("Mar")
	lst.options[4]= new Option("Apr")
	lst.options[5]= new Option("May")
	lst.options[6]= new Option("Jun")
	lst.options[7]= new Option("Jul")
	lst.options[8]= new Option("Aug")
	lst.options[9]= new Option("Sep")
	lst.options[10]= new Option("Oct")
	lst.options[11]= new Option("Nov")
	lst.options[12]= new Option("Dec")
		
}
function initYearList(lst)
{
	lst.options.length = 0
	lst.options[0]= new Option(" ")
	for(var t = 1;t< 10;t++)
	lst.options[t]= new Option("200" + t)
	lst.options[1].selected=true
}