<script>
                                    function unable(par1, par2) {
                                        popBox();
                                        function popBox() {
                                            x = confirm('Are you sure? ');
                                            if (x == true) {
                                                var xhr = new XMLHttpRequest();
                                                xhr.open("POST", "userChangeTariffOptions?contractNumber=" + par1
                                                        + "&tariffOptionId=" + par2 + "&method=unable", false);
                                                xhr.send();
                                                if (xhr.status == 405) {
                                                    alert('Incompatible options')
                                                }
                                            }
                                        }
                                    }</script>