Form submit with target="_blank" opens a popup window after ajax request instead new tab

I need some help here...

Anyone knows how to solve this?: http://jsfiddle.net/Q3BfC/5/

When I submit a form with target="_blank" by defaults opens a new tab. But if try to do it after an ajax request, the forms opens a popup window.

(function($) {
    jQuery(document).ready(function() {
        
        var launch = function(p_url) {
            var form = $('<form />').hide();
            form.attr({'action': p_url, 'target': '_blank'});
            form.appendTo(document.body);
            form.submit();
            form.remove();
            delete form;
        };
        
        $('#normal').on('click', function() {
            launch('http://www.google.com');
        });
        
        $('#ajax').on('click', function() {
            $.ajax({
                type: 'POST',
                url: '#',
                traditional: true,
                success: function() {
                    launch('http://www.google.com');
                }
            });
        });
        
    });
})(jQuery);