[jQuery] Problem with maskedinput + load

I´m passing a input value with load function and this ionput with mask
dont send any value but without works normal, who know why??
and i already tried with #id of input
//mask na consulta de os
            $("#os_id").maskedinput("9999", " ");
//consulta OS
            $("#Consultar").click(function(){
                //$("#container_formulario").hide();
                $("#loader").load("listar_os.php",
                    {
                        acao: "consultar",
                        os_id: $("input[@name=os_id]").val()
                    },
                     function(){
                         alert($("#os_id").val());
                        $("#loader").show();
                         }
                    );
                $.ajaxTimeout(5000); //milisegundosk
                $("#consulta").ajaxStop(function(){
                    $("#consulta").show();
                });
            });
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[]´s Jean
www.suissa.info
Ethereal Agency
www.etherealagency.com