Inline validation for cpf

Hi Experts,
I am trying to validate the CPF number ( brazilian id number, equivalent to ssn for USA). I am able to do that but I am trying to give an inline error message for correct and incorrect cpf number that the user entered.Recently, I am using "alert" for displaying message but I really want to get inline message instead of poping up dialog box for message. Any suggestions and help are really appreciated. Here is the code I had been working on.

<!-- begin snippet: js hide: false -->

<!-- language: lang-js -->

    <script language="javascript">
      function VerificaCPF () {
        if (vercpf(document.frmcpf.cpf.value))
          {errors="1";if (errors) alert('CPF NAO VALIDO');
          document.retorno = (errors == '');}}
        function vercpf (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")
          return false;
          add = 0;
      for (i=0; i < 9; i ++)
        add += parseInt(cpf.charAt(i)) * (10 - i);
        rev = 11 - (add % 11);
      if (rev == 10 || rev == 11)
        rev = 0;
      if (rev != parseInt(cpf.charAt(9)))
       return false;
        add = 0;
      for (i = 0; i < 10; i ++)
        add += parseInt(cpf.charAt(i)) * (11 - i);
        rev = 11 - (add % 11);
      if (rev == 10 || rev == 11)
        rev = 0;
      if (rev != parseInt(cpf.charAt(10)))
        return false;
      alert('O CPF INFORMADO E VALIDO.');return true;}

<!-- language: lang-html -->

    <title> Validation</title>
      <form name="frmcpf" method="post" action="default.html" onsubmit="VerificaCPF();">
      <table width="34%" border="1" cellspacing="0" cellpadding="0" align="center" height="51">
      <div align="center">CPF: <br />
        <input type="text" name="cpf" size="12" maxlength="11"> <br /> <br />
        <input type="button" name="Submit" value="Checar" onclick="VerificaCPF();">

<!-- end snippet -->

`enter code here`
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Lee SavidgeCommented:
Bade011Author Commented:
@Lee: I am sorry as I'm lost in above link. I could only see expression for cpf. Is it what you are trying to show me? Actually, I already did cpf validation working. I am only worry about displaying message. I want to display messages:
 "You entered correct cpf."   ->   if cpf entered is correct and
"You entered wrong cpf."     ->   if user entered wrong cpf
Currently I am displaying these message from "alert" which will pop up dialog box. I don't like this way. I am trying to figure out if I can display message by the side of input box. I hope I clarify my problem well.
Lee SavidgeCommented:
Ahh, I see. Well, stick another <div> in there and display/hide it.

Something like this:

      <div align="center">CPF: <br />
        <input type="text" name="cpf" size="12" maxlength="11"><div id="ErrorMessage" style="display: none;">Error message text here</div> <br /> <br />
        <input type="button" name="Submit" value="Checar" onclick="VerificaCPF();">

Open in new window

Then in your javascript, do something like this when the validation fails:

document.getElementById("ErrorMessage").style.display = 'block';

Open in new window

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Bade011Author Commented:
Very well. One more question: How do I use same div for 2 messages? Thanks in advance
Lee SavidgeCommented:
Have 2 divs with different ID's. Hide both by default when the page loads and control visibility via the script.

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Lee SavidgeCommented:
Glad it helped :)
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