[jQuery] If statement in form validation

[jQuery] If statement in form validation


Hi There,
I could use some help here. I need to place a condition statement
(if) in this form validation script. For some reason, I just can't
get it to work. Basically, when a user un-checks a particular box
(billing_addr) additional form fields slide down, those fields need to
be validated. If the box is checked the fields roll-up, become
disable and can be skipped. What's the best way to accomplish this?
Thanks,
MD
$(document).ready(function() {
    var billing_address = $("input[name='billing_addr']:!checked").val();
    $.metadata.setType("validate");
    $('#mysampleform').validate({
        rules: {
            first: "required",
            last: "required",
            address: "required",
            city: "required",
            state: "required",
            country: "required",
            zip: "required",
            membertype: "required",
            amount: "required",
            state: "required",
            mt: "required",
            email: true,
            if (billing_address == 1) {
                alert(billing_address);
                billing_first: "required",
                billing_last: "required",
                billing_address: "required",
                billing_city: "required",
                billing_state: "required",
                billing_zip: "required",
                billing_email: true
            }
        },
        messages: {
            first: "Please enter your first name",
        }
    });
});