//作废按钮：验证选择项 add by zhangzhu 2012-9-5

        $(document).ready(function () {

            $("#revokeBtn").click(function () {

                var count = 0;

                $("input[name=CheckBox]").each(function () {

                    if (this.checked) {

                        count++;

                    }

                });

                if (count == 0) {

                    jAlert("请选择作废项");

                    return false;

                } else if (count > 1) {

                    jAlert("只能选择一条作废项");

                    return false;

                } else {

                    return true;

                }

            });

        });