how to diselect checkbox after alert?

Question

im using datatable i need to limit the selected row. how can i diselect my last selected after alert?

 

$(function () {
           var TableExcess = $('#PaymentExcess').DataTable({
                "scrollY": '50vh',
                "scrollCollapse": true,
                "paging": false,
                "destroy": true,
                "ajax": "@Url.Action("GetPaymentExcess", "payable")",
                "columns": [
                    {
                        "render": function (data, type, full, meta) {
                            return "<input type='checkbox' class='checkbox' onclick='addavailable(" + full.Id + ", " + full.AvailableAmount + ", \"" + full.AccountName + "\", this.checked)'>"
                        }
                    },
                    { "data": "Id" },
                    { "data": "AccountName" },
                    { "data": "PaidAmount" },
                    { "data": "AvailableAmount" },
                ]
           });
        });

 var idsExcess = [];

 function addavailable(id, amount, acctname, isChecked)
        {
            if (isChecked) {
                //condition
                 idsExcess.push(id);
                 if(idsExcess.lenght > 2) {
                    var i = idsExcess.indexOf(id);
                    idsExcess.splice(i, 1);
                    alert("diselect last selected");
                    isChecked = false;
                 }

            }
            else {
                 var i = idsExcess.indexOf(id);
                idsExcess.splice(i, 1);
            }
        }