function abrir_ventana(pagina, anchura, altura, vtoolbar, vlocation, vdirectories, vstatus, vmenubar, vscrollbars, vresizable) {
    //ABRE UNA VENTANA NUEVA CON LOS DATOS Y CARACTERISTICAS ESPECIFICADOS
    var anchurapantalla;
    var alturapantalla;
    var posicionx;
    var posiciony;

    anchurapantalla = screen.width;
    alturapantalla = screen.height;

    if (anchurapantalla > screen.width) {
        anchurapantalla = screen.width;
    }
    if (alturapantalla > screen.height) {
        alturapantalla = screen.height;
    }
    posicionx = (anchurapantalla / 2) - (anchura / 2);
    posiciony = (alturapantalla / 2) - (altura / 2);
    control = window.open(pagina, 'ventana' + anchura, 'toolbar=' + vtoolbar + ',location=' + vlocation + ',directories=' + vdirectories + ',status=' + vstatus + ', menubar=' + vmenubar + ',scrollbars=' + vscrollbars + ',resizable=' + vresizable + ', width=' + anchura + ',height=' + altura + ',top=' + posiciony + ',left=' + posicionx + '');
    control.focus();
}

function abrir_ventana_destacado(pagina, anchura, altura, vtoolbar, vlocation, vdirectories, vstatus, vmenubar, vscrollbars, vresizable) {
    abrir_ventana(pagina, anchura, altura, vtoolbar, vlocation, vdirectories, vstatus, vmenubar, vscrollbars, vresizable);
}

// Funcions per validar NIF

function calcularNIF(dni) {
    var letras, numero;
    //Número introduït no és vàlid
    if (!/^\d{8}$/.test(dni))
        return '';
    letras = 'TRWAGMYFPDXBNJZSQVHLCKE';
    numero = dni % 23;
    return letras.substring(numero, numero + 1);
}

function validarNIF(nif) {
    var lletraNIF, dni, lletra;
    //Si és una tarjeta de residència substituïm la x inicial per un 0
    if (nif.substring(0, 1).toUpperCase() == 'X') {
        nif = PadLeft(nif.substring(1, nif.length), 9, '0');
    }
    else if (nif.substring(0, 1).toUpperCase() == 'Y') {
        nif = PadLeft(nif.substring(1, nif.length), 9, '1');
    }
    else if (nif.substring(0, 1).toUpperCase() == 'Z') {
        nif = PadLeft(nif.substring(1, nif.length), 9, '2');
    }
    lletraNIF = nif.substring(8, 9).toUpperCase();
    dni = nif.substring(0, 8);
    lletra = calcularNIF(dni);
    //NIF introduït no és vàlid
    if ((lletra == '') || (lletra != lletraNIF))
        return false;
    return true;
}


//Funció per validar un valor amb array d'expressions regulars
//Si hi ha un valor que validi amb una expressió regular (OR), aleshores és correcte 
function validar(regularExpressions, valor) {
    var valor = valor.toLowerCase();
    for (var i = 0; i < regularExpressions.length; i++) {
        var y = new RegExp(regularExpressions[i], "gi");
        if (y.test(valor) == true)
            return true;
    }
    return false;
}

/**
* Validació d'una compte corrent
* 
* Comprova un número de compte corrent
*
* IN:  cc1	 string	 Primers vuit dígits de la compte corrente (entitat.oficina)
* IN:  cc2  string  Últims deu dígits de la compte corrent (#compte)
* IN:  dc   string  Dígits de control
* OUT:      bool    compte vàlid? 
*/
function calcularDC(cc1, cc2) {
    var arrWeights = new Array(1, 2, 4, 8, 5, 10, 9, 7, 3, 6); // vector de pesos
    var dc1 = 0, dc2 = 0;

    /*
    * Càlcul del primer dígit de control
    */
    for (i = (cc1.length - 1); i >= 0; i--) dc1 += arrWeights[i + 2] * cc1.charAt(i);
    dc1 = 11 - (dc1 % 11);
    if (11 == dc1) dc1 = 0;
    if (10 == dc1) dc1 = 1;

    /*
    * Càlcul del segon dígit de control
    */
    for (i = (cc2.length - 1); i >= 0; i--) dc2 += arrWeights[i] * cc2.charAt(i);
    dc2 = 11 - (dc2 % 11);
    if (11 == dc2) dc2 = 0;
    if (10 == dc2) dc2 = 1;

    /*
    * Comprovar la coincidència i retornar el resultat
    */
    return (10 * dc1 + dc2); // Javascript infereix tipus sencer per dc1 i dc2
}

function validarCC(cc1, cc2, cc3, cc4) {
    return (cc3 == calcularDC(cc1 + cc2, cc4));
}

function validarLocalitzador(cc1, cc2, cc3) {
    return (cc3 == calcularDC(PadLeft(cc1, 8, '0'), PadLeft(cc2, 10, '0')));
}



//Funció per treure espais a dreta i esquerra
function Value_Trim(Value) {
    var Length;
    Length = Value.length;

    for (Cnt = 0; Cnt < Value.length && Value.charAt(Cnt) == " "; Cnt++);
    Value = Value.substr(Cnt);

    for (Cnt = Value.length - 1; Cnt >= 0 && Value.charAt(Cnt) == " "; Cnt--);
    Value = Value.substring(0, Cnt + 1);

    return (Value);
}

function PadLeft(cadena, longitud, caracter) {
    var longCadena = cadena.length;
    var sTmp;
    sTmp = "";
    if (longCadena >= longitud) {
        return cadena;
    }
    sTmp = cadena
    for (cnt = 0; cnt < longitud - longCadena; cnt++) {
        sTmp = caracter + sTmp;
    }
    return sTmp;
}

//Funcions per verificar targetes de crèdit


function mod10(cardNumber) { // LUHN Formula for validation of credit card numbers.
    var ar = new Array(cardNumber.length);
    var i = 0, sum = 0;

    for (i = 0; i < cardNumber.length; ++i) {
        ar[i] = parseInt(cardNumber.charAt(i));
    }
    for (i = ar.length - 2; i >= 0; i -= 2) { // you have to start from the right, and work back.
        ar[i] *= 2; 						 // every second digit starting with the right most (check digit)
        if (ar[i] > 9) ar[i] -= 9; 		 // will be doubled, and summed with the skipped digits.
    } 									 // if the double digit is > 9, ADD those individual digits together 
    for (i = 0; i < ar.length; ++i) {
        sum += ar[i]; 					 // if the sum is divisible by 10 mod10 succeeds
    }
    return (((sum % 10) == 0) ? true : false);
}

function expired(month, year) {
    var now = new Date(); 						// this function is designed to be Y2K compliant.
    var expiresIn = new Date(year, month, 0, 0, 0); 	// create an expired on date object with valid thru expiration date
    expiresIn.setMonth(expiresIn.getMonth() + 1); 	// adjust the month, to first day, hour, minute & second of expired month
    if (now.getTime() < expiresIn.getTime()) return false;
    return true; 								// then we get the miliseconds, and do a long integer comparison
}

function validateCard(cardNumber, cardType, cardMonth, cardYear) {
    if (cardNumber.length == 0) {						//most of these checks are self explanitory
        alert("Please enter a valid card number.");
        return false;
    }
    for (var i = 0; i < cardNumber.length; ++i) {		// make sure the number is all digits.. (by design)
        var c = cardNumber.charAt(i);
        if (c < '0' || c > '9') {
            alert("Please enter a valid card number. Use only digits. do not use spaces or hyphens.");
            return false;
        }
    }
    var length = cardNumber.length; 		//perform card specific length and prefix tests
    switch (cardType) {
        case 'a':
            if (length != 15) {
                alert("Please enter a valid American Express Card number.");
                return;
            }
            var prefix = parseInt(cardNumber.substring(0, 2));
            if (prefix != 34 && prefix != 37) {
                alert("Please enter a valid American Express Card number.");
                return;
            }
            break;
        case 'd':
            if (length != 16) {
                alert("Please enter a valid Discover Card number.");
                return;
            }
            var prefix = parseInt(cardNumber.substring(0, 4));
            if (prefix != 6011) {
                alert("Please enter a valid Discover Card number.");
                return;
            }
            break;
        case 'm':
            if (length != 16) {
                alert("Please enter a valid MasterCard number.");
                return;
            }
            var prefix = parseInt(cardNumber.substring(0, 2));
            if (prefix < 51 || prefix > 55) {
                alert("Please enter a valid MasterCard Card number.");
                return;
            }
            break;
        case 'v':
            if (length != 16 && length != 13) {
                alert("Please enter a valid Visa Card number.");
                return;
            }
            var prefix = parseInt(cardNumber.substring(0, 1));
            if (prefix != 4) {
                alert("Please enter a valid Visa Card number.");
                return;
            }
            break;
    }
    if (!mod10(cardNumber)) { 		// run the check digit algorithm
        alert("Sorry! this is not a valid credit card number.");
        return false;
    }
    if (expired(cardMonth, cardYear)) {							// check if entered date is already expired.
        alert("Sorry! The expiration date you have entered would make this card invalid.");
        return false;
    }
    return true; // at this point card has not been proven to be invalid
}