function scrollTo (id)
{
        var offset = $('#' + id).offset();
        var top = offset.top;

        $('html, body').animate({scrollTop:top}, 'slow');
}

function checkMail (mail) {
    var er = new RegExp(/^[A-Za-z0-9_\-\.]+@[A-Za-z0-9_\-\.]{2,}\.[A-Za-z0-9]{2,}(\.[A-Za-z0-9])?/);
    
    if (typeof(mail) == "string") {
        if (er.test(mail)) {
            return true;
        }
    } else if (typeof(mail) == "object") {
        if (er.test(mail.value)) {
            return true;
        }
    }
    return false;
}

function shareOrkut(titulo, subtitulo, link, imgParentSelector){
    var params = {};
    params[google.orkut.share.Field.TITLE] = titulo;
    params[google.orkut.share.Field.DESTINATION_URL] = link;
    imgs = [];
    $( imgParentSelector+' img').each(function() {
        imgs.push($(this).attr('src'));
    });
    params[google.orkut.share.Field.CONTENT] = subtitulo;
    params[google.orkut.share.Field.THUMBNAIL] = imgs;
    var connection = new google.orkut.share.Connection(params);
    connection.send('orkut.com', {});
}

var cards = new Array();

cards [0] = {
    name: "Visa",
    length: "13,16",
    prefixes: "4",
    checkdigit: true
};
cards [1] = {
    name: "MasterCard",
    length: "16",
    prefixes: "51,52,53,54,55",
    checkdigit: true
};
cards [2] = {
    name: "DinersClub",
    length: "14,16",
    prefixes: "305,36,38",
    checkdigit: true
};
cards [3] = {
    name: "CarteBlanche",
    length: "14",
    prefixes: "300,301,302,303,304,305",
    checkdigit: true
};
cards [4] = {
    name: "AmEx",
    length: "15",
    prefixes: "34,37",
    checkdigit: true
};
cards [5] = {
    name: "Discover",
    length: "16",
    prefixes: "6011,622,64,65",
    checkdigit: true
};
cards [6] = {
    name: "JCB",
    length: "16",
    prefixes: "35",
    checkdigit: true
};
cards [7] = {
    name: "enRoute",
    length: "15",
    prefixes: "2014,2149",
    checkdigit: true
};
cards [8] = {
    name: "Solo",
    length: "16,18,19",
    prefixes: "6334, 6767",
    checkdigit: true
};
cards [9] = {
    name: "Switch",
    length: "16,18,19",
    prefixes: "4903,4905,4911,4936,564182,633110,6333,6759",
    checkdigit: true
};
cards [10] = {
    name: "Maestro",
    length: "12,13,14,15,16,18,19",
    prefixes: "5018,5020,5038,6304,6759,6761",
    checkdigit: true
};
cards [11] = {
    name: "VisaElectron",
    length: "16",
    prefixes: "417500,4917,4913,4508,4844",
    checkdigit: true
};
cards [12] = {
    name: "LaserCard",
    length: "16,17,18,19",
    prefixes: "6304,6706,6771,6709",
    checkdigit: true
};

function detectCardName (cardnumber) {

    var res = '';

    for(i=0; i<cards.length; i++) {
        pref = cards[i].prefixes.split(',');
        for(x=0; x < pref.length; x++) {
            res += pref[x] + ' - ' + cardnumber.substring(0,pref[x].length) + '<br />';
            if(pref[x] == cardnumber.substring(0,pref[x].length)) {
                return cards[i].name.toLowerCase();
            }
        }
    }
    return false;
}

function checkCreditCard (cardnumber, cardname) {

    // Define the cards we support. You may add addtional card types.

    //  Name:      As in the selection box of the form - must be same as user's
    //  Length:    List of possible valid lengths of the card number for the card
    //  prefixes:  List of possible prefixes for the card
    //  checkdigit Boolean to say whether there is a check digit



    // Establish card type
    var cardType = -1;
    for (var i=0; i<cards.length; i++) {


        // See if it is this card (ignoring the case of the string)
        if (cardname.toLowerCase () == cards[i].name.toLowerCase()) {
            cardType = i;
            break;
        }
    }

    // If card type not found, report an error
    if (cardType == -1) {
        ccErrorNo = 0;
        return false;
    }

    // Ensure that the user has provided a credit card number
    if (cardnumber.length == 0)  {
        ccErrorNo = 1;
        return false;
    }

    // Now remove any spaces from the credit card number
    cardnumber = cardnumber.replace (/\s/g, "");

    // Check that the number is numeric
    var cardNo = cardnumber
    var cardexp = /^[0-9]{13,19}$/;
    if (!cardexp.exec(cardNo))  {
        ccErrorNo = 2;
        return false;
    }

    // Now check the modulus 10 check digit - if required
    if (cards[cardType].checkdigit) {
        var checksum = 0;                                  // running checksum total
        var mychar = "";                                   // next char to process
        var j = 1;                                         // takes value of 1 or 2

        // Process each digit one by one starting at the right
        var calc;
        for (i = cardNo.length - 1; i >= 0; i--) {


            // Extract the next digit and multiply by 1 or 2 on alternative digits.
            calc = Number(cardNo.charAt(i)) * j;

            // If the result is in two digits add 1 to the checksum total
            if (calc > 9) {
                checksum = checksum + 1;
                calc = calc - 10;
            }

            // Add the units element to the checksum total
            checksum = checksum + calc;

            // Switch the value of j
            if (j ==1) {
                j = 2
            } else {
                j = 1
            };
        }

        // All done - if checksum is divisible by 10, it is a valid modulus 10.
        // If not, report an error.
        if (checksum % 10 != 0)  {
            ccErrorNo = 3;
            return false;
        }
    }


    // The following are the card-specific checks we undertake.
    var LengthValid = false;
    var PrefixValid = false;
    var undefined;


    // We use these for holding the valid lengths and prefixes of a card type
    var prefix = new Array ();
    var lengths = new Array ();

    // Load an array with the valid prefixes for this card
    prefix = cards[cardType].prefixes.split(",");

    // Now see if any of them match what we have in the card number
    for (i=0; i<prefix.length; i++) {
        var exp = new RegExp ("^" + prefix[i]);
        if (exp.test (cardNo)) PrefixValid = true;
    }

    // If it isn't a valid prefix there's no point at looking at the length
    if (!PrefixValid) {
        ccErrorNo = 3;
        return false;
    }

    // See if the length is valid for this card
    lengths = cards[cardType].length.split(",");
    for (j=0; j<lengths.length; j++) {
        if (cardNo.length == lengths[j]) LengthValid = true;
    }

    // See if all is OK by seeing if the length was valid. We only check the
    // length if all else was hunky dory.
    if (!LengthValid) {
        ccErrorNo = 4;
        return false;
    };

    // The credit card is in the required format.
    return true;
}
function validateCard (errorField) {
    cardText = document.getElementById('numero-cartao');
    myCardNo = document.getElementById('numero-cartao').value;
    myCardType = document.getElementById('tipo-pagto').value;
    
    if (checkCreditCard (myCardNo,myCardType))
    {
        errorField.style.visibility='hidden';
        errorField.innerHTML="";
        cardText.style.border='#339900 solid 1px';
        return "";
    }
    else
    {//alert (ccErrors[ccErrorNo])
        errorField.innerHTML="Número do cartão de crédito inválido";
        errorField.style.visibility='visible';
        errorField.style.border='#FF3333 solid 1px';
        errorField.style.background='#FBE3E4';
        errorField.style.color='#8a1f11';
        errorField.style.fontSize='10px';
        cardText.style.border='#FF3333 solid 1px';
        return false;
    }
}