show new form after checked

<div class="form-group">
                                                                        <label for="">Peralatan Penunjang</label><br>
                                                                        <div class="row">
                                                                            <div class="col-md-6">
                                                                                <?php
                                                                                $i = 1;
                                                                                $data_peralatan_penunjang = explode(";", $peralatan_penunjang);
                                                                                $list = array("ESU/Cauter", "Suction");
                                                                                foreach ($list as $row) {
                                                                                    if (in_array($row, $data_peralatan_penunjang)) {
                                                                                        $checked = "checked";
                                                                                    } else {
                                                                                        $checked = '';
                                                                                    }
                                                                                    echo '<input type="checkbox" ' . $checked . ' name="peralatan_penunjang[]" id="peralatan_penunjang' . $i++ . '" value="' . $row . '"> ' . $row . ' <br>';
                                                                                }
                                                                                ?>
                                                                            </div>
                                                                            <div class="col-md-6">
                                                                                <?php
                                                                                $i = 3;
                                                                                $data_peralatan_penunjang = explode(";", $peralatan_penunjang);
                                                                                $list = array("Laparoskopi", "Lain-Lain");
                                                                                foreach ($list as $row) {
                                                                                    if (in_array($row, $data_peralatan_penunjang)) {
                                                                                        $checked = "checked";
                                                                                    } else {
                                                                                        $checked = '';
                                                                                    }
                                                                                    echo '<input type="checkbox" ' . $checked . ' name="peralatan_penunjang[]" id="peralatan_penunjang' . $i++ . '" value="' . $row . '" onclick="penunjang_lain(this.id)"> ' . $row . ' <br>';
                                                                                }
                                                                                ?>
                                                                            </div>
                                                                        </div>
                                                                    </div>
                                                                    <div class="form-group" id="peralatan_penunjang4_lain" style="display: none;">
                                                                        <label for="">Pelatan Penunjang Lain</label>
                                                                        <input type="text" name="peralatan_penunjang_lain" id="peralatan_penunjang_lain" class="form-control" value="<?php echo $peralatan_penunjang_lain; ?>">
                                                                    </div>


var peralatan_penunjang_lain = $('#peralatan_penunjang_lain').val();
        if (peralatan_penunjang_lain != '') {
            $("#peralatan_penunjang4_lain").fadeIn();
        }

function penunjang_lain(id) {
    var checkBox = document.getElementById(id);
    var text = document.getElementById(id + "_lain");
    if (text != null) {
    if (checkBox.checked == true) {
      text.style.display = "block";
    } else {
      text.style.display = "none";
    }
    }
  }