[jQuery] Jquery form and validation plugins

Hi everyone.....
Immediately apologize: to be a lot of code…

I have a form to add users:
<form action="http://localhost/ci_doctrine/signup/submit";
method="post" id="myForm">

<p><label for="username">Username: <em></em></label>
<input type="text" name="username" value="" id="username"  />   </p>

<p><label for="password">Password: <em></em></label>
<input type="password" name="password" value="" id="password"  />       </p>

<p><label for="passconf">Confirm Password: <em></em></label>
<input type="password" name="passconf" value="" id="passconf"  />       </p>

<p><label for="email">E-mail: <em></em></label>
<input type="text" name="email" value="" id="email"  /> </p>

<p><input type="submit" name="submit" value="Create my account"  />     </
p>
</form>

Nothing special…

Respectively included:
<script type="text/javascript" src="js/jquery-1.3.2.min.js"></script>
<script type="text/javascript" src="js/jquery.form.js"></script>
<script type="text/javascript" src="js/jquery.validate.js"></script>
<script type="text/javascript" src="js/signup.js"></script>

And my js-file signup.js
$(document).ready(
    function()
    {
        var options = {
            timeout: 3000,
            clearForm: true,
            success: function(data) {
                        $("#output").text(data);
                     }

        };

        $("#myForm").validate({
                submitHandler: function(form) {
                    $(form).ajaxSubmit(options);
                },
                debug: true,
                focusInvalid: false,
                focusCleanup: true,
                rules: {
                    username: {
                        required: true,
                        minlength: 6,
                        maxlength: 12,
                        remote: {
                            url: "userCheck/",
                            type: "post",
                            data: {
                              username: function() {
                                return $("#username").val();
                              }
                            }
                        }

                    },
                    password: {
                        required: true,
                        rangelength: [6, 24]
                    },
                    passconf: {
                        required: true,
                        rangelength: [6, 24],
                        equalTo: "#password"
                    },
                    email: {
                        required: true,
                        email: true
                    }
                },
                messages: {
                      <some messages>
                },
                errorPlacement: function(error, element) {
                    var er = element.attr("name");
                    error.appendTo( element.parent().find("label
[for='" + er + "']").find("em") );

        });
    }
 );
The problem is that when I click the submit button that runs a script
"usercheck" from remote rule. I see it in Firebug. And nothing is
added to the database.
How can now send data to the server? Why doesn’t work submitHandler??

Thanks for any help