var months = new Array('January','February','March','April',
                       'May','June','July','August','September',
                       'October','November','December');

function doCalcNumNight(obj){	
	var oForm =document.resvForm;
	var strInDay = oForm.inday.value;
	var strInMonth = getMonthDigit(oForm.inmonth.value);
	var strInYear = oForm.inyear.value;	

	var strOutDay = oForm.outday.value;
	var strOutMonth = getMonthDigit(oForm.outmonth.value);
	var strOutYear = oForm.outyear.value;	

	if ( (!isDate(strInYear,strInMonth,strInDay)) || (!isDate(strOutYear,strOutMonth,strOutDay)) ){
		oForm.nights.value=0;
		return false;
	}else if( !isDateLessThan(new Date(strInYear,strInMonth-1,strInDay),new Date(strOutYear,strOutMonth-1,strOutDay))) {
		oForm.nights.value=0;
		return false;
	}else{
		oForm.nights.value =daysElapsed(new Date(strOutYear,strOutMonth-1,strOutDay),new Date(strInYear,strInMonth-1,strInDay));
		return true;
	}
}	

function doCalcOutDate(forceNumNight){
	var oForm =document.resvForm;
	if(!oForm.nights){
		//if undefined;
		return false;		
	}
	var strText = oForm.nights.value;
	var strInDay = oForm.inday.value;
	var strInMonth = getMonthDigit(oForm.inmonth.value);
	var strInYear = oForm.inyear.value;	

	if (!!forceNumNight){
		oForm.nights.value =forceNumNight;
	}

	if ( !isNumeric(oForm.nights) ){
         alert("The Number of Nights field must be a number. \nPlease re-enter.");
         //oForm.nights.value=3;
         oForm.nights.select();
         oForm.nights.focus();
         return false;	
	}else if (!isDate(strInYear,strInMonth,strInDay)) {
		alert("Invalid Check in Date");
		return false;
	}else{
		var oDate = new Date(addDays(new Date(strInYear,strInMonth-1,strInDay),oForm.nights.value));
		oForm.outday.value = oDate.getDate();
		oForm.outmonth.value = months[oDate.getMonth()].substring(0,3);
		oForm.outyear.value = oDate.getYear();
		return true;		
	}
}

function onlyNumber(){
	strKey = window.event.keyCode
	alert(strKey);
	if (strKey < 48 || strKey > 57)
		{window.event.keyCode = null;}
}

function test(e){
var charCode = (navigator.appName=="Netscape") ? e.which : e.keyCode;

//alert(charCode);
if (charCode==13){
	//doSubmit();
	//return false;	
//}else{
//return true;
}
}

function isNumeric(obj){
	for (var i=0; i<obj.value.length; i++){
      var ch = obj.value.substring(i, i + 1);
      if ((ch < "0" || "9" < ch) && ch != ' ')  {
         return false;
         }
     }
     return true;
}
function addDays(date1,number) {
    var outDate = new Date(date1.getTime() + number*24*60*60*1000);
    return outDate
	//alert(days[outDate.getDay()] + " " + outDate.getDate() + "/"+ months[outDate.getMonth()] + "/" + outDate.getYear());
	/*oForm.txtOutDate.value = outDate.getDate();
	oForm.txtOutDay.value = days[outDate.getDay()];
	oForm.txtOutMonth.value = months[outDate.getMonth()];
	oForm.txtOutYear.value = outDate.getYear();
	*/
}

function getMonthDigit(strMonthName){
	switch (strMonthName.toLowerCase()){
		case 'jan':
			return "1";
		case 'feb':
			return '2';
		case 'mar':		
			return '3';
		case 'apr':
			return '4';
		case 'may':
			return '5';
		case 'jun':		
			return '6';
		case 'jul':
			return '7';
		case 'aug':
			return '8';
		case 'sep':		
			return '9';
		case 'oct':
			return '10';
		case 'nov':
			return '11';
		case 'dec':		
			return '12';
		default:
			return '0';

	}//switch
}

function y2k(d) { 
	return (d < 1000) ? d + 1900 : d;
}

function isDate (year, month, day) {
// month argument must be in the range 1 - 12
	month = month - 1; // javascript month range : 0- 11
	var tempDate = new Date(year,month,day);
	if ( (y2k(tempDate.getYear()) == year) && (month == tempDate.getMonth()) &&	(day == tempDate.getDate()) ){
		return true;
	}else{
		return false
	}
}

function isDateLessThan(date1,date2){
	if (date1 < date2){
		return true;
	}else{
		return false;
	}
}

function daysElapsed(date1,date2) {
    var difference =
        Date.UTC(y2k(date1.getYear()),date1.getMonth(),date1.getDate(),0,0,0)
      - Date.UTC(y2k(date2.getYear()),date2.getMonth(),date2.getDate(),0,0,0);
    return difference/1000/60/60/24;
}

function doSubmit(){
	var oForm =document.resvForm;
	var strInDay = oForm.inday.value;
	var strInMonth = getMonthDigit(oForm.inmonth.value);
	var strInYear = oForm.inyear.value;	
	
	var strOutDay = oForm.outday.value;
	var strOutMonth = getMonthDigit(oForm.outmonth.value);
	var strOutYear = oForm.outyear.value;

	var now = new Date();	

	if ( !isNumeric(oForm.nights) ){
         alert("The Number of Nights field must be a number. \nPlease re-enter.");
         oForm.nights.select();
         oForm.nights.focus();
         return false;	
	}else if ( (!isDate(strInYear,strInMonth,strInDay)) || (!isDate(strOutYear,strOutMonth,strOutDay)) ){
		alert("Check in Date and/or Check out Date does not exist in the month selected.\nPlease correct the selected day and/or year.");
		oForm.nights.value=0;
		return false;
	}else if(daysElapsed(new Date(strInYear,strInMonth-1,strInDay),now) < 0) {
		alert("Check-in Date is in the past.\nPlease select a new date.");
		oForm.inday.focus();
		return false;
	}else if( !isDateLessThan(new Date(strInYear,strInMonth-1,strInDay),new Date(strOutYear,strOutMonth-1,strOutDay))) {
		alert("Check Out Date must be later than Check-in Date");
		oForm.nights.value=0;
		return false;
	}else if ( (oForm.nights.value=="0") || (oForm.nights.value > 45) ){
		alert("Number of Nights must be between 1 and 45. Maximum Number of Nights allowed is 45.\nFor stays of longer than 45 days, please contact our Customer Service Agents.");
		//oForm.nights.focus();
		return false;
	}else if(parseInt(oForm.NoRm.value) > parseInt(oForm.noAdult.value)){
		alert('You must have at least one adult per room. Please change your number of rooms or adults accordingly.');
		oForm.NoRm.focus();
		return false;	
	}else if((parseInt(oForm.noAdult.value) + parseInt(oForm.noChild.value)) > 20){
		alert('Maximum of 20 people is allowed. Please amend the number of adults or children for this booking.');
		oForm.noAdult.focus();
		return false;		
	}else if(parseInt(oForm.NoExtra.value) > parseInt(oForm.NoRm.value)){
		alert("The number of Extra Beds required cannot be greater than the number of rooms requested.");
		oForm.NoExtra.focus();
		return false;
	}
}