// JavaScript Document

// Submitsform on pressing return
function checkEnter(e,vFormIn)
{
var characterCode 

if(e && e.which)
	{ //if which property of event object is supported (NN4)
	e = e;
	characterCode = e.which; //character code is contained in NN4's which property
	}
	else
	{
	e = event;
	characterCode = e.keyCode; //character code is contained in IE's keyCode property
	}

		if(characterCode == 13)
		{ //if generated character code is equal to ascii 13 (if enter key)
		if (vFormIn == "1") {document.form1.submit()}
		if (vFormIn == "2") {document.form2.submit()}
		if (vFormIn == "3") {document.form3.submit()}
		if (vFormIn == "4") {document.form4.submit()}
		if (vFormIn == "5") {document.form5.submit()}
		if (vFormIn == "11") {document.form11.submit()}
		if (vFormIn == "12") {document.form12.submit()}
		if (vFormIn == "13") {document.form13.submit()}
								
		//Do the checkForms
		if (vFormIn == "C1") {submitformcheck()}
		if (vFormIn == "C2") {submitformcheck2()}
		if (vFormIn == "C3") {submitformcheck3()}
		if (vFormIn == "C4") {submitformcheck4()}
		}
}

//returns the relevant mesage on returning from other things
function ConfirmationMeassage(CodeIn)
{
if (CodeIn == "SF") {alert("Your email has been sent")}
if (CodeIn == "SB") {alert("Your shopping basket has been updated")}
if (CodeIn == "AS") {alert("Your favourites list has been updated")}
}
//This will submit forms and do some bits witht the login box
function closewindow()
{
window.close();
}
function submitform()
{
document.form1.submit();
}
function submitform2()
{
document.form2.submit();
}
//********************************************************************************************************
//************************************** Date checking functions *****************************************
//********************************************************************************************************

function ProcDate(DayIn,MonthIn,YearIn,FormIn)
{
	var d = new Date()
	var NewMonth
	

	d.setFullYear(YearIn)
	d.setMonth(MonthIn-1)
	d.setDate(DayIn)
	
	var NewDateString
	
	vdatestring = DayIn + "/" + MonthIn + "/" + YearIn
	 
	 if (isDate(vdatestring) == false) 					 
					 {
					 alert("That is not a valid date")
					 }
					 else
					 { 
						 NewDateString = d.toString().substr(4,6)+ ", "  + d.toString().substr(11,4);
					 	 if (FormIn == 0) {document.form1.Idate.value = NewDateString}
						 if (FormIn == 1) {document.form1.date1.value = NewDateString}
						 if (FormIn == 2) {document.form1.date2.value = NewDateString}
						 if (FormIn == 3) {document.form1.date3.value = NewDateString}
						
						 
						 //From and to dates
						 if (FormIn == 21) {document.form1.FromDate.value = NewDateString}
						 if (FormIn == 22) {document.form1.ToDate.value = NewDateString}
						 if (FormIn == 211) {document.form1.AFromDate.value = NewDateString}
						 if (FormIn == 221) {document.form1.AToDate.value = NewDateString}
					 }
}


var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("The date format should be : dd/mm/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
return true
}

function CheckForZeros()
{
if  (document.form1.nMonth.value > 0 && document.form1.nYear.value > 0)
	{
	ProcDate(1,document.form1.nMonth.value,document.form1.nYear.value,1);
	}
	else
	{
		alert(document.form1.nMonth.value);
		alert(document.form1.nYear.value);
		}
}