[Dilettante_Pro]

espltd,
Попробуйте такой вариант:

var card = $('#card').val();         
alert(card);
                $.ajax({
                type: "POST",
                url: '/adm/cardsact/addcard',              
                //dataType: "json",
                data: "card=" + card,
                success: function(data)
                {
                    alert(data);                   
                 }
             });

что покажет alert(card)?