// Start Arrival / Departure dates changer
 function OpenCalendar(dayField, day, monthField, month, yearField, year)
 {
 file = 'formName=frm_Search';
 if ( dayField != null )
 file += '&dayField=' + dayField + '&day=' + day;
 if ( monthField != null )
 file += '&monthField=' + monthField + '&month=' + month;
 if ( yearField != null )
 file += '&yearField=' + yearField + '&year=' + year;
 }

// Checks if browser is Netscape 2.0x since the options array properties don't work with Netscape 2.0x
function isBrowserSupp() {
 // Get the version of the browser
 version = parseFloat( navigator.appVersion );

 if ( ( version >= 2.0 ) && ( version < 2.1 ) && ( navigator.appName.indexOf( "Netscape" ) != -1 ) ) {
 return false;
 }
 else {
 return true;
 }

return true;
}
 
function isLeapYear(yrStr)
{
var leapYear=false;
var year = parseInt(yrStr, 10);
// every fourth year is a leap year
if (year%4 == 0)
 {
 leapYear=true;
 // unless it's a multiple of 100
 if (year%100 == 0)
 {
 leapYear=false;
 // unless it's a multiple of 400
 if (year%400 == 0)
 {
 leapYear=true;
 }
 }
 }
return leapYear;
}


function getDaysInMonth(mthIdx, YrStr)
{
// all the rest have 31
var maxDays=31
// expect Feb. (of course)
if (mthIdx==1)
 {
 if (isLeapYear(YrStr))
 {
 maxDays=29;
 }
 else
 {
 maxDays=28;
 }
 }
// thirty days hath...
if (mthIdx==3 || mthIdx==5 || mthIdx==8 || mthIdx==10)
 {
 maxDays=30;
 }
return maxDays;
}


//the function which does some magic to the date fields
// return non-zero if it is the last day of the month
function adjustDate(mthIdx, Dt)
{
var value=0;

var today = new Date()
var theYear = parseInt(today.getYear(),10)

if (mthIdx < today.getMonth()) {
 theYear = (parseInt(today.getYear(), 10) + 1)
}
if(theYear<100){
 theYear = "19" + theYear
}
else{
 if((theYear-100) < 10){
 theYear = "0" + (theYear-100)
 }
 else{
 theYear = (theYear-100)+""
 }
 theYear = "20" + theYear
}


var numDays=getDaysInMonth(mthIdx, theYear);

if (mthIdx==0)
 {
 if (Dt.options.selectedIndex + 1 < numDays)
 {
 return 0;
 }
 else
 {
 Dt.options.selectedIndex=numDays - 1;
 //check for leap year
 if (numDays==29)
 {
 return 99;
 }
 else
 {
 return 1;
 }
 }
 }
if (Dt.options.selectedIndex + 1 < numDays)
 {
 value=0;
 }
else
 {
 if (Dt.options.selectedIndex + 1 > numDays)
 {
 Dt.options.selectedIndex--;
 value=3;
 }
 else
 {
 //index is 31 or 30
 value=2;
 }
 }
return value;
}

//changes departure month when arrival month is changed
function amadChange(inM,inD,outM,outD)
{
if (!isBrowserSupp())
 {
 return;
 }

var res = adjustDate(inM.options.selectedIndex, inD);
if (res != 0)
 {
 outD.options.selectedIndex=0;
 if (outM.options.selectedIndex==11){
 outM.options.selectedIndex=0
 }
 else{
 outM.options.selectedIndex=inM.options.selectedIndex + 1;
 }
 }
else
 {
 outM.options.selectedIndex = inM.options.selectedIndex;
 outD.options.selectedIndex = inD.options.selectedIndex+1;
 }
return;
}

function dmddChange(outM,outD)
{
if (!isBrowserSupp())
 {
 return;
 }

adjustDate(outM.options.selectedIndex,outD);
return;
}
// Start Arrival / Departure dates changer