// show the billing panel to input
function useBillingInfo() {

    var obj_t = FIND('ctl_UseBillingAddress');
    var obj_s = FIND('panel_billaddr');
    var oValue = obj_t.checked;

    if (oValue) {
        obj_s.style.visibility = 'visible';
        obj_s.style.height = 'auto';
    } else {
        obj_s.style.visibility = 'hidden';
        obj_s.style.height = '0px';
    }
}

// show simple information of selected location
function change_Location200908() {

    var obj_s = FIND('ctl_selLoc');
    var obj_t = FIND('tb_briefInfo');

    //alert(obj_s.selectedIndex);

    if (obj_s.selectedIndex == 0) {
        obj_t.value = "When: Aug 15, 16 / Where: Los Angeles, CA";
    } else if (obj_s.selectedIndex == 1) {
        obj_t.value = "When: Aug 29, 30 / Where: Berkeley, CA";
    }
}
function change_Location200912() {

    var obj_s = FIND('ctl_selLoc');
    var obj_t = FIND('tb_briefInfo');

    //alert(obj_s.selectedIndex);

    if (obj_s.selectedIndex == 0) {
        obj_t.value = "When: Dec 5, 6 / Where: Berkeley, CA";
    }
}



function UserAction(oValue) {

    var obj = FIND('oAction');
    //alert(oValue);

    if (CheckCardNumber()) {
        //alert("ok");
        obj.value = oValue;
        document.forms['form1'].submit();
    }
    
}

// recalculate total
function change_registerOption() {

    var oday1 = FIND('ctl_selDay1');
    var oday2 = FIND('ctl_selDay2');
    var orate = FIND('ctl_selRate');
    var otarget = FIND('tb_totalPrice');
    var ratelist = new Array(125, 95);

    var days = 0;
    if (oday1.checked) ++days;
    if (oday2.checked) ++days;

    var totalAmt = ratelist[orate.selectedIndex] * days;

    otarget.value = "$" + totalAmt + ".00";
}


var Cards = new makeArray(3);
Cards[0] = new CardType("Master", "51,52,53,54,55", "16");
var Master = Cards[0];
Cards[1] = new CardType("Visa", "4", "13,16");
var Visa = Cards[1];
Cards[2] = new CardType("Amex", "34,37", "15");
var Amex = Cards[2];

/*************************************************************************\
CheckCardNumber(form)
function called when users click the "check" button.
\*************************************************************************/
function CheckCardNumber() {

    var ocardnum = FIND('tb_card_number');
    var oExpY = FIND('tb_card_expyy');
    var oExpM = FIND('tb_card_expmm');

    var ocardtype1 = FIND('ctl_cardtype_1');
    var ocardtype2 = FIND('ctl_cardtype_2');
    var ocardtype3 = FIND('ctl_cardtype_3');
    
    
    var tmpyear;
    if (ocardnum.value.length == 0) {
        alert("Please enter a Card Number.");
        ocardnum.focus();
        return false;
    }

    if (oExpM.value < 1 || oExpM.value > 12) {
        alert("Please enter valid Expiration Month.");
        return false;
    }

    if (oExpY.value.length == 0) {
        alert("Please enter the Expiration Year.");
        oExpY.focus();
        return false;
    }
    if (oExpY.value > 96)
        tmpyear = "19" + oExpY.value;
    else if (oExpY.value < 21)
        tmpyear = "20" + oExpY.value;
    else {
        alert("The Expiration Year is not valid.");
        return false;
    }

    tmpmonth = oExpM.value;
    
    // The following line doesn't work in IE3, you need to change it
    // to something like "(new CardType())...".
    // if (!CardType().isExpiryDate(tmpyear, tmpmonth)) {
    if (!(new CardType()).isExpiryDate(tmpyear, tmpmonth)) {
        alert("This card has already expired.");
        return false;
    }


    if(ocardtype1.checked)
        card = ocardtype1.value;
        
    else if (ocardtype2.checked)
        card = ocardtype2.value;
        
    else if (ocardtype3.checked)
        card = ocardtype3.value;


    var retval = eval(card + ".checkCardNumber(\"" + ocardnum.value + "\", " + tmpyear + ", " + tmpmonth + ");");
    cardname = "";
    if (retval) 

    // comment this out if used on an order form
    //alert("This card number appears to be valid.");
        return true;


    else {
        // The cardnumber has the valid luhn checksum, but we want to know which
        // cardtype it belongs to.
        for (var n = 0; n < Cards.size; n++) {
            if (Cards[n].checkCardNumber(ocardnum.value, tmpyear, tmpmonth)) {
                cardname = Cards[n].getCardType();
                break;
            }
        }
        if (cardname.length > 0) {
            alert("This looks like a " + cardname + " number, not a " + card + " number.");
            return false;
        }
        else {
            alert("This card number is not valid.");
            return false;
        }
    }
}
/*************************************************************************\
Object CardType([String cardtype, String rules, String len, int year, 
int month])
cardtype    : type of card, eg: MasterCard, Visa, etc.
rules       : rules of the cardnumber, eg: "4", "6011", "34,37".
len         : valid length of cardnumber, eg: "16,19", "13,16".
year        : year of expiry date.
month       : month of expiry date.
eg:
var VisaCard = new CardType("Visa", "4", "16");
var AmExCard = new CardType("AmEx", "34,37", "15");
\*************************************************************************/
function CardType() {
    var n;
    var argv = CardType.arguments;
    var argc = CardType.arguments.length;

    this.objname = "object CardType";

    var tmpcardtype = (argc > 0) ? argv[0] : "CardObject"; 
    var tmprules = (argc > 1) ? argv[1] : "0,1,2,3,4,5,6,7,8,9";
    var tmplen = (argc > 2) ? argv[2] : "13,14,15,16,19";

    this.setCardNumber = setCardNumber;  // set CardNumber method.
    this.setCardType = setCardType;  // setCardType method.
    this.setLen = setLen;  // setLen method.
    this.setRules = setRules;  // setRules method.
    this.setExpiryDate = setExpiryDate;  // setExpiryDate method.

    this.setCardType(tmpcardtype);
    this.setLen(tmplen);
    this.setRules(tmprules);
    if (argc > 4)
        this.setExpiryDate(argv[3], argv[4]);

    this.checkCardNumber = checkCardNumber;  // checkCardNumber method.
    this.getExpiryDate = getExpiryDate;  // getExpiryDate method.
    this.getCardType = getCardType;  // getCardType method.
    this.isCardNumber = isCardNumber;  // isCardNumber method.
    this.isExpiryDate = isExpiryDate;  // isExpiryDate method.
    this.luhnCheck = luhnCheck; // luhnCheck method.
    return this;
}

/*************************************************************************\
boolean checkCardNumber([String cardnumber, int year, int month])
return true if cardnumber pass the luhncheck and the expiry date is
valid, else return false.
\*************************************************************************/
function checkCardNumber() {
    var argv = checkCardNumber.arguments;
    var argc = checkCardNumber.arguments.length;
    var cardnumber = (argc > 0) ? argv[0] : this.cardnumber;
    var year = (argc > 1) ? argv[1] : this.year;
    var month = (argc > 2) ? argv[2] : this.month;

    this.setCardNumber(cardnumber);
    this.setExpiryDate(year, month);

    if (!this.isCardNumber())
        return false;
    if (!this.isExpiryDate())
        return false;

    return true;
}
/*************************************************************************\
String getCardType()
return the cardtype.
\*************************************************************************/
function getCardType() {
    return this.cardtype;
}
/*************************************************************************\
String getExpiryDate()
return the expiry date.
\*************************************************************************/
function getExpiryDate() {
    return this.month + "/" + this.year;
}
/*************************************************************************\
boolean isCardNumber([String cardnumber])
return true if cardnumber pass the luhncheck and the rules, else return
false.
\*************************************************************************/
function isCardNumber() {
    var argv = isCardNumber.arguments;
    var argc = isCardNumber.arguments.length;
    var cardnumber = (argc > 0) ? argv[0] : this.cardnumber;
    if (!this.luhnCheck())
        return false;

    for (var n = 0; n < this.len.size; n++)
        if (cardnumber.toString().length == this.len[n]) {
        for (var m = 0; m < this.rules.size; m++) {
            var headdigit = cardnumber.substring(0, this.rules[m].toString().length);
            if (headdigit == this.rules[m])
                return true;
        }
        return false;
    }
    return false;
}

/*************************************************************************\
boolean isExpiryDate([int year, int month])
return true if the date is a valid expiry date,
else return false.
\*************************************************************************/
function isExpiryDate() {
    var argv = isExpiryDate.arguments;
    var argc = isExpiryDate.arguments.length;

    year = argc > 0 ? argv[0] : this.year;
    month = argc > 1 ? argv[1] : this.month;

    if (!isNum(year + ""))
        return false;
    if (!isNum(month + ""))
        return false;
    today = new Date();
    expiry = new Date(year, month);
    if (today.getTime() > expiry.getTime())
        return false;
    else
        return true;
}

/*************************************************************************\
boolean isNum(String argvalue)
return true if argvalue contains only numeric characters,
else return false.
\*************************************************************************/
function isNum(argvalue) {
    argvalue = argvalue.toString();

    if (argvalue.length == 0)
        return false;

    for (var n = 0; n < argvalue.length; n++)
        if (argvalue.substring(n, n + 1) < "0" || argvalue.substring(n, n + 1) > "9")
        return false;

    return true;
}

/*************************************************************************\
boolean luhnCheck([String CardNumber])
return true if CardNumber pass the luhn check else return false.
Reference: http://www.ling.nwu.edu/~sburke/pub/luhn_lib.pl
\*************************************************************************/
function luhnCheck() {
    var argv = luhnCheck.arguments;
    var argc = luhnCheck.arguments.length;

    var CardNumber = argc > 0 ? argv[0] : this.cardnumber;

    if (!isNum(CardNumber)) {
        return false;
    }

    var no_digit = CardNumber.length;
    var oddoeven = no_digit & 1;
    var sum = 0;

    for (var count = 0; count < no_digit; count++) {
        var digit = parseInt(CardNumber.charAt(count));
        if (!((count & 1) ^ oddoeven)) {
            digit *= 2;
            if (digit > 9)
                digit -= 9;
        }
        sum += digit;
    }
    if (sum % 10 == 0)
        return true;
    else
        return false;
}

/*************************************************************************\
ArrayObject makeArray(int size)
return the array object in the size specified.
\*************************************************************************/
function makeArray(size) {
    this.size = size;
    return this;
}

/*************************************************************************\
CardType setCardNumber(cardnumber)
return the CardType object.
\*************************************************************************/
function setCardNumber(cardnumber) {
    this.cardnumber = cardnumber;
    return this;
}

/*************************************************************************\
CardType setCardType(cardtype)
return the CardType object.
\*************************************************************************/
function setCardType(cardtype) {
    this.cardtype = cardtype;
    return this;
}

/*************************************************************************\
CardType setExpiryDate(year, month)
return the CardType object.
\*************************************************************************/
function setExpiryDate(year, month) {
    this.year = year;
    this.month = month;
    return this;
}

/*************************************************************************\
CardType setLen(len)
return the CardType object.
\*************************************************************************/
function setLen(len) {
    // Create the len array.
    if (len.length == 0 || len == null)
        len = "13,14,15,16,19";

    var tmplen = len;
    n = 1;
    while (tmplen.indexOf(",") != -1) {
        tmplen = tmplen.substring(tmplen.indexOf(",") + 1, tmplen.length);
        n++;
    }
    this.len = new makeArray(n);
    n = 0;
    while (len.indexOf(",") != -1) {
        var tmpstr = len.substring(0, len.indexOf(","));
        this.len[n] = tmpstr;
        len = len.substring(len.indexOf(",") + 1, len.length);
        n++;
    }
    this.len[n] = len;
    return this;
}

/*************************************************************************\
CardType setRules()
return the CardType object.
\*************************************************************************/
function setRules(rules) {
    // Create the rules array.
    if (rules.length == 0 || rules == null)
        rules = "0,1,2,3,4,5,6,7,8,9";

    var tmprules = rules;
    n = 1;
    while (tmprules.indexOf(",") != -1) {
        tmprules = tmprules.substring(tmprules.indexOf(",") + 1, tmprules.length);
        n++;
    }
    this.rules = new makeArray(n);
    n = 0;
    while (rules.indexOf(",") != -1) {
        var tmpstr = rules.substring(0, rules.indexOf(","));
        this.rules[n] = tmpstr;
        rules = rules.substring(rules.indexOf(",") + 1, rules.length);
        n++;
    }
    this.rules[n] = rules;
    return this;
}