Máscara em campos com jQuery

Máscara em campos com jQuery

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script src="http://wmonline.ucoz.com.br/download/maskedinput-1.1.2.pack.js"></script>
<form method="post">
   CPF: <input type="text" name="cpf" id="cpf" />
   <br>

</form>

JavaScript

$(document).ready(function() {
    $(function() {
        $('#cpf').val(11);
        $("#cpf").mask("999:99");

    });
});