var loadUrl=b_url+page;
        if (History.enabled) {History.pushState({state:2}, page, "/"+page);}
        window.name=page;
        $.ajax({
            cache: false,
            async: false,
            type: "POST",
            url: loadUrl,
            dataType: "html",
            beforeSend: function() {
                 $('.contentarea').animate({
                        'opacity'   : 0
                    }, 180, 'jswing', function(){
                            $('#mainc').hide(350, 'jswing');
                });
             },
            success: function(response) {
                $('#mainc').html(response);
                alert('success')
            },
            failure: function(msg) {
                alert('FAIL');
            }
        });

$('#mainc').html(response);

$(document).ajaxError(function(e, xhr, settings, exception) {
alert('error in: ' + settings.url + ' n'+'error:n' + xhr.responseText );
});

$('#mainc').ajaxComplete(function(){ alert('bob')})

$("#mainc").load(loadUrl);

$("#mainc").load(loadUrl, function(){ alert('bob' });

$("#mainc").load(loadUrl);