// 수량변경 및 삭제
    $(document).on("click", "#sit_sel_option li button", function() {
        var mode = $(this).text();
        var this_qty, max_qty = 9999, min_qty = 1;
        var $el_qty = $(this).closest("li").find("input[name^=ct_qty]");
        var stock = parseInt($(this).closest("li").find("input.io_stock").val());
        switch(mode) {
            case "증가":
                this_qty = parseInt($el_qty.val().replace(/[^0-9]/, "")) + 1;
                if(this_qty > stock) {
                    alert("재고수량 보다 많은 수량을 구매할 수 없습니다.");
                    this_qty = stock;
                }
                if(this_qty > max_qty) {
                    this_qty = max_qty;
                    alert("최대 구매수량은 "+number_format(String(max_qty))+" 입니다.");
                }
                $el_qty.val(this_qty);
                price_calculate();
                break;
            case "감소":
                this_qty = parseInt($el_qty.val().replace(/[^0-9]/, "")) - 1;
                if(this_qty < min_qty) {
                    this_qty = min_qty;
                    alert("최소 구매수량은 "+number_format(String(min_qty))+" 입니다.");
                }
                $el_qty.val(this_qty);
                price_calculate();
                break;
            case "삭제":
                if(confirm("선택하신 옵션항목을 삭제하시겠습니까?")) {
                    var $el = $(this).closest("li");
                    var del_exec = true;
                    if($("#sit_sel_option .sit_spl_list").size() > 0) {
                        // 선택옵션이 하나이상인지
                        if($el.hasClass("sit_opt_list")) {
                            if($(".sit_opt_list").size() <= 1)
                                del_exec = false;
                        }
                    }
                    if(del_exec) {
                        $el.closest("li").remove();
                        price_calculate();
                    } else {
                        alert("선택옵션은 하나이상이어야 합니다.");
                        return false;
                    }
                }
                break;
            default:
                alert("올바른 방법으로 이용해 주십시오.");
                break;
        }
    });