รบกวนช่วยดูเรื่อง การ next page หน่อยครับ

<?php 
@session_start();
include ('theme.php');
include ('session.php');
include ('navbar_member.php');
include ("connect.php");//เรียกใช้ไฟล์การเชื่อมต่อDATABASE SERVERและฐานข้อมูล
?>
<?php
    ini_set('display_errors', 1);
    error_reporting(~0);

    $strKeyword = null;

    if(isset($_POST["txtKeyword"]))
    {
      $strKeyword = $_POST["txtKeyword"];
    }
    if(isset($_GET["txtKeyword"]))
    {
      $strKeyword = $_GET["txtKeyword"];
    }
?>
<script type="text/javascript" src="js/jquery-1.4.3.min.js"></script>
<script type="text/javascript" src="fancybox/jquery.mousewheel-3.0.4.pack.js"></script>
<script type="text/javascript" src="fancybox/jquery.fancybox-1.3.4.pack.js"></script>
<link rel="stylesheet" type="text/css" href="fancybox/jquery.fancybox-1.3.4.css" media="screen">
<script type="text/javascript">
        $(document).ready(function() {
    

            $('a[id^="edit"]').fancybox({
                'width'             : '30%',
                'height'            : '60%',
                'autoScale'         : false,
                'transitionIn'      : 'none',
                'transitionOut'     : 'none',
                'type'              : 'iframe',
                onClosed    :   function() {
                    parent.location.reload(true); 
                }
            });

            

        });
    </script>
<div class="container">
    <div class="row">
        <div class="box">
            <center><h3> ข้อมูลห้องเรียน </h3></center> 
                <div class="col-md-6">
                </div> 
                    <div class="col-md-6">
                      <div class="pull-right">
                        <!-- form สำหรับค้นหาข้อมูล -->
                        <form name="frmSearch" class="form-inline" method="post" action="<?php echo $_SERVER['SCRIPT_NAME'];?>">
                          <div class="form-group">
                            <input class="form-control" name="txtKeyword" type="text" id="txtKeyword" value="<?php echo $strKeyword;?>" placeholder="พิมพ์ค้นหาตามต้องการ">
                            <input type="submit" value="ค้นหา" class="btn btn-success">
                          </div>
                        </form>
                      </div>
                    </div>


                         <?php 

                            $sql = "SELECT `equipment_id`,`room_name`,room_type_name,building_name,`room_count`,room_count_exams,janitor_name, equipment_name
                                    FROM bk_room_equipment re
                                    LEFT JOIN bk_room_details rd on(re.idroom = rd.idroom) 
                                    LEFT JOIN bk_equipment e on (re.id_equipment = e.id_equipment) 
                                    LEFT JOIN bk_equipment_status et on (re.id_status_em =et.id_status_em )
                                    LEFT JOIN bk_room_type rt on(rd.id_room_type = rt.id_room_type)
                                    LEFT JOIN bk_building b on (rd.id_building_name = b.id_building_name) 
                                    LEFT JOIN bk_janitor j on (rd.id_janitor =j.id_janitor ) 
                                    WHERE (`room_type_name` = 'ห้องเรียนปรับอากาศ' or `room_type_name` = 'ห้องเรียนรวม' or `room_type_name` = 'ห้องบรรยาย') and concat( `equipment_id`,`room_name`,room_type_name,building_name,`room_count`,room_count_exams,janitor_name) 
                                    LIKE '%".$strKeyword."%' GROUP BY room_name";

                            $query = $mysqli->query($sql);
                            $num_rows = mysqli_num_rows($query);

                                $per_page = 10;   // Per Page
                                $page  = 1;
                                
                                if(isset($_GET["Page"]))
                                {
                                  $page = $_GET["Page"];
                                }

                                $prev_page = $page-1;
                                $next_page = $page+1;

                                $row_start = (($per_page*$page)-$per_page);
                                if($num_rows<=$per_page)
                                {
                                  $num_pages =1;
                                }
                                else if(($num_rows % $per_page)==0)
                                {
                                  $num_pages =($num_rows/$per_page) ;
                                }
                                else
                                {
                                  $num_pages =($num_rows/$per_page)+1;
                                  $num_pages = (int)$num_pages;
                                }
                                $row_end = $per_page ;
                                if($row_end > $num_rows)
                                {
                                  $row_end = $num_rows;
                                }

                                $sql .= " ORDER BY equipment_id ASC LIMIT $row_start ,$row_end ";
                                $query = $mysqli->query($sql);

                        ?>
                        <br>
                        <br>
                        </br>  
                        </br>
                       
                        <div class="table-responsive">
                        <table class="table table-hover table-bordered">
                            <thead>
                                <tr bgcolor="#0083CA" >
                                    
                                    <td width="32" align="center" rowspan="2" valign="middle"><font color="#FFFFFF">ลำดับ             </font></td>
                                    <td width="50" align="center" rowspan="2" valign="middle"><font color="#FFFFFF">ชื่อห้อง       </font></td>
                                    <td width="100" align="center" rowspan="2" valign="middle"><font color="#FFFFFF">ประเภทห้อง            </font></td>
                                    <td width="32" align="center" rowspan="2" valign="middle"><font color="#FFFFFF">ชื่ออาคาร          </font></td>
                                    <td width="10" align="center" rowspan="2" valign="middle"><font color="#FFFFFF">ความจุห้องเรียน         </font></td>
                                    <td width="100" align="center" rowspan="2" valign="middle"><font color="#FFFFFF">ความจุห้องสอบ         </font></td>
                                    <td width="100" align="center" rowspan="2" valign="middle"><font color="#FFFFFF">ผู้ดูแลห้อง          </font></td>
                                    <td width="100" align="center" rowspan="2" valign="middle"><font color="#FFFFFF">อุปกรณ์ภายในห้อง          </font></td>
                                    
                                </tr>
                                
                            </thead>
                            <?php
                            $i=1;
                            if(mysqli_num_rows($query)){
                            while($row = mysqli_fetch_array($query))
                            {
                                
                            ?>
                              <tr>
                                <td><div align="center"><?=$i;?></div></td>
                                <td><?=$row["room_name"];?></td>
                                <td><?=$row["room_type_name"];?></td>
                                <td><div align="center"><?=$row["building_name"];?></div></td>
                                <td align="center"><?=$row["room_count"];?></td>
                                <td align="center"><?=$row["room_count_exams"];?></td>
                                <td ><?=$row["janitor_name"];?></td>
                                <td align="center"><a id="edit<?=$i;?>" class="various iframe" href="show_equipment.php?show_id=<?=$row["room_name"];?>"><button class='btn btn-warning btn-sm' >&nbsp;รายละเอียดอุปกรณ์&nbsp;</button></a></td>
                                
                                
                              </tr>
                            <?php
                            $i++;
                            }
                            }else{
                                echo "<tr><td colspan='8' class='text-center'><span style='font-size:1.5em;' class='label label-danger'> ไม่มีข้อมูล !!!!</span></td></tr>";
                            }
                            ?>
                        </table>
                        </div>
                       
                        <center>
                            <nav>
                              <ul class="pagination">
                                <li>
                                  <?php echo "<a href='$_SERVER[SCRIPT_NAME]?Page=1&txtKeyword=$strKeyword'>
                                  <span aria-hidden='true'>&laquo;</span></a>"; ?>
                                </li>
                                <?php for($i=1;$i<=$num_pages;$i++){ ?>
                                <li>
                                  <?php echo "<a href='$_SERVER[SCRIPT_NAME]?Page=$i&txtKeyword=$strKeyword'>$i</a>"; ?>
                                </li>
                                <?php } ?>
                                <li>
                                  <?php echo "<a href='$_SERVER[SCRIPT_NAME]?Page=$num_pages&txtKeyword=$strKeyword'>
                                  <span aria-hidden='true'>&raquo;</span></a>"; 
                                  ?>
                                </li>
                              </ul>
                            </nav>
                        </center>
        </div>
    </div>
</div>
<?php 
include ('footer.php');
?>