var digits = "0123456789";
var phoneNumberDelimiters = "()- ";
var validWorldPhoneChars = phoneNumberDelimiters + "+";
var minDigitsInIPhoneNumber = 10;
var zipre = /\d{5}(-\d{4})?/
var zip = ''; 
var cvv = '';
var name = '';
var addr1 = '';

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++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function checkInternationalPhone(strPhone){
	s=stripCharsInBag(strPhone,validWorldPhoneChars);
	return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}

function echeck(str) {
	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)
	if (str.indexOf(at)==-1){
		alert("E-mail ID should be in abc@xyz.com format.")
		return false
	}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		alert("E-mail ID should be in abc@xyz.com format.")
		return false
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		alert("E-mail ID should be in abc@xyz.com format.")
		return false
	}

		if (str.indexOf(at,(lat+1))!=-1){
		alert("E-mail ID should be in abc@xyz.com format.")
		return false
		}

		if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		alert("E-mail ID should be in abc@xyz.com format.")
		return false
		}

		if (str.indexOf(dot,(lat+2))==-1){
		alert("E-mail ID should be in abc@xyz.com format.")
		return false
		}
	
		if (str.indexOf(" ")!=-1){
		alert("E-mail ID should be in abc@xyz.com format.")
		return false
		}
 		return true					
}
	
function charCount(key, textbox)
        {
             var maxSize = 240;
            if (key == 8 && textbox.value.length != 0) 
            {
	            textbox.value = textbox.value.substring(0, textbox.value.length);
	            document.getElementById("txtChars").value = maxSize - (textbox.value.length)
	        }
            if (textbox.value.length <= maxSize) 
	        {
	           document.getElementById("txtChars").value = maxSize - (textbox.value.length)
	         }
            else
            {
	            textbox.value = textbox.value.substring(0, maxSize);  
	            alert("More than 240 characters are not allowed.")
	            return false; 
	        }
            return false;
        }


	
	function isValidCreditCard(type1, txtccnum,txthcardnum, month, year,pzip,pcvv,pname,paddr) 
	{
		zip = pzip.value;
		cvv = pcvv.value;
		name = pname.value;
		addr1 = paddr.value

		if(txtccnum.value.length == 0 && txthcardnum.value == 0 ) 
		{ 
			alert('Credit Card Number is required.');
			txtccnum.focus();
			return false;
		}
		var ccnum; 
		if(txtccnum.value.length > 0 ) 
			ccnum = txtccnum.value;
		else
			ccnum = txthcardnum.value;
		
		var type = GetSelectedItem(type1);
		if (type == "Visa") {
      // Visa: length 16, prefix 4, dashes optional.
		var re = /^4\d{3}-?\d{4}-?\d{4}-?\d{4}$/;
		} else if (type == "MC") {
		// Mastercard: length 16, prefix 51-55, dashes optional.
		var re = /^5[1-5]\d{2}-?\d{4}-?\d{4}-?\d{4}$/;
		} else if (type == "Disc") {
		// Discover: length 16, prefix 6011, dashes optional.
		var re = /^6011-?\d{4}-?\d{4}-?\d{4}$/;
		} else if (type == "AmEx") {
		// American Express: length 15, prefix 34 or 37.
		var re = /^3[4,7]\d{13}$/;
		} else if (type == "Diners") {
		// Diners: length 14, prefix 30, 36, or 38.
		var re = /^3[0,6,8]\d{12}$/;
		}
		
		if (!re.test(ccnum)) { alert('Invalid Card Number');  return false;}
		// Checksum ("Mod 10")
		// Add even digits in even length strings or odd digits in odd length strings.
		var checksum = 0;
		for (var i=(2-(ccnum.length % 2)); i<=ccnum.length; i+=2) {
			checksum += parseInt(ccnum.charAt(i-1));
   }
   // Analyze odd digits in even length strings or even digits in odd length strings.
		for (var i=(ccnum.length % 2) + 1; i<ccnum.length; i+=2) 
		{
			var digit = parseInt(ccnum.charAt(i-1)) * 2;
			if (digit < 10) { checksum += digit; } else { checksum += (digit-9); }
		}
		if ((checksum % 10) == 0) 
			  if(isExpiryDate(GetSelectedItem(month),GetSelectedItem(year)))  //check for expiry month and year
				if(others())
					return true; 
				else
					return false;
			  else
				{alert('Card expired.');
				return false;
				}
		else 
		{
			alert('Invalid Card Number');
			txtccnum.focus();
			return false;
		}
}

function others()
{
	var zp = zip.value;
	if(zipre.test(zp)) {alert('Zip required.'); return false;}
	if(name.length == 0) {alert('Name required.'); return false;}
	if(cvv.length == 0 ) {alert('CVV required.'); return false;}
	if(addr1.length == 0 ) {alert('Address required.'); return false;}
	return true;
}

/*************************************************************************\
boolean isExpiryDate([int year, int month])
return true if the date is a valid expiry date,
else return false.
\*************************************************************************/
function isExpiryDate(month, year) 
{
	today = new Date();
	//alert(today.getFullYear())
	//expiry = new Date(year, month,1);
	if (year < today.getFullYear())
		return false;

	if (year == today.getFullYear())
	  if((month >= today.getMonth()+1))
		return true;
	  else
		return  false;

	if (year >= today.getFullYear())
		return true;	
}


function GetSelectedItem(obj) 
{
	len = obj.length
	i = 0
	chosen = "none"
	for (i = 0; i < len; i++) 
	{
		if (obj[i].selected) 
		{
			chosen = obj[i].value
		} 
	}
return chosen
} 


//////
// Declaring valid date character, minimum year and maximum year
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 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 strMonth=dtStr.substring(0,pos1)
	var strDay=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 : mm/dd/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 clickButton(e, btnId)
{
	if ((event.which && event.which == 13) ||(event.keyCode && event.keyCode == 13))
	{	
		document.getElementById(btnId).click();
		return false;
	}
}