[jQuery] post via AJAX, expecting "script" in return: doesn't work in Safari

[CarmineM]

Hi everyone,

I'm facing a problem with jQuery and AJAX. I am trying to post a form
via AJAX (to a Rails backend), knowing that the returned data type is
"script".

So far, the code I wrote work in Firefox 3.x while in Safari, the form
gets actually posted (and the database update accordingly), while the
UI doesn't receive any update.

Here follows the js code:

$(function() {

        var first_time = true;
        var $d = '';

        $('#product_thumbs').jcarousel({ vertical: true, scroll: 2});

        tb_init('a.thickbox');

        $('#others').flexigrid({ height: 'auto' });

        $('p.no_comments').fadeIn(600);
        $('#comments').fadeOut(0);
        $('#comments').fadeIn(1200);

        $('#product_show_tabs').tabs();

        $('a.add_comment').click(function(){
                $('#new_comment_wrapper').load($(this).attr('href'), function() 
{

                        $('#new_comment').submit(function(){
                                $.post($(this).attr("action"), 
$(this).serialize(), null,
'script');
                                $d.dialog('close');
                                return false;
                        });

                        if (first_time == true ){

/*
  The following code is a workaround to prevent dialog not showing up
upon subsequent requests. Needs further investigation.

*/
                                $d = $('#new_comment').dialog({
                                        bgiFrame: true
                                        ,modal: true
                                        ,draggable: false
                                        ,resizable: false
                                        ,title: 'Nuovo commento'
                                        ,width: 400
                                        ,autoOpen: false
                                });

                                first_time = false;
                        }

                        $d.dialog('open');

                });
                return false;
        });

});

Of course I'm ensuring that the post is submitted as a javascript
request using:

$.ajaxSetup({
  beforeSend: function(xhr){ xhr.setRequestHeader('Accept', 'text/
javascript') }
});

Can you, please, help me?

Thanks in advance.

Regards