Hi if am submit the query i got undefined value for this method... any one can tell how to validate this array validation.?

Hi if am submit the query i got undefined value for this method... any one can tell how to validate this array validation.?

Html:

<SELECT NAME="Members[]" id="Members[]" SIZE="8" MULTIPLE="" STYLE="clear:right; float:none;" onDblClick="objForm.Users.transferFrom('Members[]');" class="list-box-user" >


//JS

<script>
        $("#inform").click(function() {
       
   

var user = $('#Members[]').val(), error;
             // var locations = $('#Members').val();
            //alert(locations);
             
            var ajaxUrl = 'includes/validation.php?valid=useradd&   '&members=' + user;

            $.ajax({
                type: "POST",
                url: ajaxUrl,
                data: "",
                dataType: 'json',
                success: function(msg) {
                //alert(msg);
                    if (msg != "")
                    {
                        $(".error").html("");
                        $(".err").attr("style", "");
                        $.each(msg, function(key, value) {

                            if (value != "") {
                               <!-- $("#" + key).attr("style", "border:1px solid #09668E;");-->
$("#"+key).attr("style","border:1px solid #660000;");

                                $("#User_" + key).html(value);
                            }
                        });

                    }

                    else
                    {

                        $("#users").submit();
                    }

                }
            });
            return false;
        });

    </script>