function Limpar(valor, validos) {
    // retira caracteres invalidos da string
    var result = "";
    var aux;
    for (var i=0; i < valor.length; i++) {
        aux = validos.indexOf(valor.substring(i, i+1));
        if (aux>=0) {
            result += aux;
        }
    }
    return result;
}


function Formata(campo,tammax,teclapres,decimal) {
    var tecla = teclapres.keyCode;
    vr = Limpar(campo.value,"0123456789");
    tam = vr.length;
    dec=decimal
			
    if (tam < tammax && tecla != 8){
        tam = vr.length + 1 ;
    }
			
    if (tecla == 8 )
    {
        tam = tam - 1 ;
    }
			
    if ( tecla == 8 || tecla >= 48 && tecla <= 57 || tecla >= 96 && tecla <= 105 )
    {
			
        if ( tam <= dec )
        {
            campo.value = vr ;
        }
			
        if ( (tam > dec) && (tam <= 5) ){
            campo.value = vr.substr( 0, tam - 2 ) + "," + vr.substr( tam - dec, tam ) ;
        }
        if ( (tam >= 6) && (tam <= 8) ){
            campo.value = vr.substr( 0, tam - 5 ) + "." + vr.substr( tam - 5, 3 ) + "," + vr.substr( tam - dec, tam ) ;
        }
        if ( (tam >= 9) && (tam <= 11) ){
            campo.value = vr.substr( 0, tam - 8 ) + "." + vr.substr( tam - 8, 3 ) + "." + vr.substr( tam - 5, 3 ) + "," + vr.substr( tam - dec, tam ) ;
        }
        if ( (tam >= 12) && (tam <= 14) ){
            campo.value = vr.substr( 0, tam - 11 ) + "." + vr.substr( tam - 11, 3 ) + "." + vr.substr( tam - 8, 3 ) + "." + vr.substr( tam - 5, 3 ) + "," + vr.substr( tam - dec, tam ) ;
        }
        if ( (tam >= 15) && (tam <= 17) ){
            campo.value = vr.substr( 0, tam - 14 ) + "." + vr.substr( tam - 14, 3 ) + "." + vr.substr( tam - 11, 3 ) + "." + vr.substr( tam - 8, 3 ) + "." + vr.substr( tam - 5, 3 ) + "," + vr.substr( tam - 2, tam ) ;
        }
    }
}

function remove(str, sub) {
    i = str.indexOf(sub);
    r = "";
    if (i == -1) return str;
    r += str.substring(0,i) + remove(str.substring(i + sub.length), sub);
    return r;
}

function validarCPF(cpf){
    
    var filtro = /^\d{3}.\d{3}.\d{3}-\d{2}$/i;
    if(!filtro.test(cpf)){
        //window.alert("CPF inválido. Tente novamente.");
        return false;
    }

    cpf = remove(cpf, ".");
    cpf = remove(cpf, "-");

    if(cpf.length != 11 || cpf == "00000000000" || cpf == "11111111111" ||
        cpf == "22222222222" || cpf == "33333333333" || cpf == "44444444444" ||
        cpf == "55555555555" || cpf == "66666666666" || cpf == "77777777777" ||
        cpf == "88888888888" || cpf == "99999999999"){
        //window.alert("CPF inválido. Tente novamente.");
        return false;
    }

    soma = 0;
    for(i = 0; i < 9; i++)
        soma += parseInt(cpf.charAt(i)) * (10 - i);
    resto = 11 - (soma % 11);
    if(resto == 10 || resto == 11)
        resto = 0;
    if(resto != parseInt(cpf.charAt(9))){
        //window.alert("CPF inválido. Tente novamente.");
        return false;
    }
    soma = 0;
    for(i = 0; i < 10; i ++)
        soma += parseInt(cpf.charAt(i)) * (11 - i);
    resto = 11 - (soma % 11);
    if(resto == 10 || resto == 11)
        resto = 0;
    if(resto != parseInt(cpf.charAt(10))){
        //window.alert("CPF inválido. Tente novamente.");
        return false;
    }
    return true;
}