[jQuery] jquery validation

[bookme]

Hi, I am using Jquery plugin for client side validation. But due to a
filedname I am facing a problem.

Example
var validator = $("#UserSignupForm").validate({
                rules: {
                        data[User][username]: {
                                required: true,
                                minlength: 2,
                                remote: "users.php"
                        }

});

HTML :<input id="id_username1" name="data[User][username]" type="text"
value="" maxlength="50" />

When I am using data[User][username] as a filed name in jquery
validation,  it's not working but in case of other name like username
it's working. I think there is problem of [][] (bracket of array). But
I can not change  data[User][username] so I  want to use id_username1
instead of filename in validation plugin but don't know how to use
ID ?.

Is there any other solution?

Also I have to face same problem in many plugins becuase CakePHP
return name like data[User][username] so How can I override a name
from ID?

Please Help me
Thanks