[jQuery] Jquery form plugin can't find resolution

[NHARRY]

I have a form that is loaded using .load it is then posted using the
jquery form plugin. But it won't post see code:


 <script type="text/javascript">
$(document).ready(function() {
        //shows loading screen whilst posting via ajax
        $().ajaxStart($.blockUI).ajaxStop($.unblockUI);

        //post form add_customer ajax
        var options = {
        target: '#alert',
    };
           $('#add_customer').submit(function() {
                $(this).ajaxSubmit(options);
                return false;
            });

//load form
$('#theform').hide().load('form.php', function() {
$(this).fadeIn();
 return false;
});

});
    </script>

I am sure there are others that have had this problem. Help ismuch
appreciated.