function fieldMask(objeto, evt, mask) {
  var LetrasU = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
  var LetrasL = 'abcdefghijklmnopqrstuvwxyz';
  var Letras  = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
  var Numeros = '0123456789';
  var Fixos  = '().-:/ ';
  var Charset = " !\"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_/`abcdefghijklmnopqrstuvwxyz{|}~";

  evt = (evt) ? evt : (window.event) ? window.event : "";
  var value = objeto.value;
  if (evt) {
   var ntecla = (evt.which) ? evt.which : evt.keyCode;
   tecla = Charset.substr(ntecla - 32, 1);
   if (ntecla < 32) return true;

   var tamanho = value.length;
   if (tamanho >= mask.length) return false;

   var pos = mask.substr(tamanho,1);
   while (Fixos.indexOf(pos) != -1) {
    value += pos;
    tamanho = value.length;
    if (tamanho >= mask.length) return false;
    pos = mask.substr(tamanho,1);
   }

   switch (pos) {
     case '#' : if (tecla == '' || Numeros.indexOf(tecla) == -1) return false; break;
     case 'A' : if (LetrasU.indexOf(tecla) == -1) return false; break;
     case 'a' : if (LetrasL.indexOf(tecla) == -1) return false; break;
     case 'Z' : if (Letras.indexOf(tecla) == -1) return false; break;
     case '*' : objeto.value = value; return true; break;
     default : return false; break;
   }
  }
  objeto.value = value;
  return true;
}

function mask(obj, evt, type) {
  switch(type) {
    case 'cep': return fieldMask(obj, evt, '#####-###'); break
    case 'tel_ddd': return fieldMask(obj, evt, '(##) ####-####'); break
    case 'tel': return fieldMask(obj, evt, '####-####'); break
    case 'cpf': return fieldMask(obj, evt, '###.###.###-##'); break
    case 'cnpj': return fieldMask(obj, evt, '##.###.###/####-##'); break
    case 'data': return fieldMask(obj, evt, '##/##/####'); break
    case 'ano/mes': return fieldMask(obj, evt, '####/##'); break
    default: return fieldMask(obj, evt, type); break;
  }
}

function is_email(email){
  var er = new RegExp(/^[A-Za-z0-9_\-\.]+@[A-Za-z0-9_\-\.]{2,}\.[A-Za-z0-9]{2,}(\.[A-Za-z0-9])?/);
  if (er.test(email)) {
    return true;
  } else {
    return false;
  }
}


function is_cpf(strcpf)
{
  if (strcpf != "" && strcpf != null) {
    str_aux = "";
    for (i = 0; i <= strcpf.length - 1; i++) {
      if ((strcpf.charAt(i)).match(/\d/)) {
        str_aux += strcpf.charAt(i);
      }
      else if (!(strcpf.charAt(i)).match(/[\.\-]/)) {
        return false;
      }
    }
    
    if (str_aux.length != 11) {
      return false;
    }

    for (i=0;i<11;i++) {
      for (j=i+1;j<11;j++) {
        if (strcpf.charAt(i) != strcpf.charAt(j)) {
          j = 12;
          i = 12;
        }
      }
    }

    if (i == 11) {
      return false;
    }
  
    soma1 = soma2 = 0;

    for (i = 0; i <= 8; i++) {
      soma1 += str_aux.charAt(i) * (10-i);
      soma2 += str_aux.charAt(i) * (11-i);
    }

    d1 = ((soma1 * 10) % 11) % 10;
    d2 = (((soma2 + (d1 * 2)) * 10) % 11) % 10;

    if ((d1 != str_aux.charAt(9)) || (d2 != str_aux.charAt(10))) {
      return false;
    }

    return true;
  } else {
    return false;
  }
}