I am using the form plugin to post my form. Everything works fine until I try and load an external page. See here:

 <script type="text/javascript">
$(document).ready(function() {                   
    //shows loading screen whilst posting via ajax
    $().ajaxStart($.blockUI).ajaxStop($.unblockUI);
   
    var options = {
        target: '#alert',
       
    };
    // bind form using 'ajaxForm'
    $('#add_customer').ajaxForm(options);
 
//load form.php
$('#theform').hide().load('form.php', function() {
$(this).fadeIn();
});

});
    </script>   

Now Loading the page works correctly but the ajax for the form post  doesn't.