ปัญหาจากการแบ่งหน้าเพื่อแสดงผลข้อมูลแสดงผลถูกต้องเฉพาะหน้าแรก ส่วนหน้าถัดไปไม่แสดงผลข้อมูล

//------------------------------------------------------------
$Per_Page = 25;   // Per Page
$Page = $_GET["Page"];
if(!$_GET["Page"])
{
   $Page=1;
}
   $Prev_Page = $Page-1;
   $Next_Page = $Page+1;
   $Page_Start = (($Per_Page*$Page)-$Per_Page);

if($rx<=$Per_Page)
{
   $rx_Pages =1;
}
else if(($rx % $Per_Page)==0)
{
   $Num_Pages =($rx/$Per_Page) ;
}
else
{
   $Num_Pages =($rx/$Per_Page)+1;
   $Num_Pages = (int)$Num_Pages;
}

//---------------------------------------------------------
$sql_f = "select * from subject where id_dep='$id'";
$result_= mysql_query($sql_f);
$rx = mysql_num_rows($result_);

$sql_f .=" order by number ASC LIMIT $Page_Start , $Per_Page";
$objQuery = mysql_query($sql_f);


echo "<table border = 1 cellpadding='1' cellspacing='0' style='border-collapse: collapse' width = 1000  bordercolor='#FFFFFF'>";
 echo "<tr height=35>";
echo "<td  colspan=8 background='img/head_bar.jpg'>";
echo "<CENTER><font class=X22>รายชื่อกิจกรรมที่เกี่ยวข้องกับ&nbsp;&nbsp;<U>$xbrandname</U></font>&nbsp;";
echo "</CENTER></td>";
echo "</tr>";

 echo "<tr height =40 bgcolor=#FFFFFF><td align=center colspan=8><font class=X22>มีข้อมูลทั้งหมด&nbsp;&nbsp;$rx&nbsp;&nbsp;รายการ</td></tr>";
echo "<tr bgcolor=#FFD553  height=40>";
echo "<td  align=center width=5%><font class=X3>ลำดับที่</td>";
echo "<td  align=center width=10%><font class=X3>รหัสกิจกรรม</td>";
echo "<td  align=center width=60><font class=X3>ชื่อกิจกรรม</td>";
echo "<td  align=center width=20% ><font class=X3>กระทรวง</td>";
echo "<td  align=center width=15%><font class=X3>กรม</td>";
echo "<td  align=center width =15%><font class=X3>กอง/สำนัก</td>";
echo "<td  align=center width =6%><font class=X3>เข้าชม</td>";

echo "</tr>";
if($rx==0) {
	echo "<tr bgcolor=#FFFFFF><td colspan=8 align=center height=50>";
	echo "<font class=X4>ไม่พบรายการใด ๆ จากการค้นหา";
	echo "</td></tr>";
}

$no = 0;

if($Page > 1)
{
  $no = ($Per_Page * $Page) - 25;
}

while($row = mysql_fetch_array($result_))
	{
       $no++;
					$a = trim($row["number"]); 
					$b = trim($row["name"]); 
					$c = trim($row["id_dep"]); 
					$d = trim($row["kom"]); 
					$e = trim($row["kong"]); 
					$f = trim($row["filename"]); 
					$g = trim($row["view"]); 

					echo "<tr valign=center bgcolor=#E6E3E3 height=20 onmouseover=over(this) onmouseout=out(this)>";
					echo "<td align=center>";
 				    echo "<a href='add_data.php?ID=$a' class=X33>$no</a>";
					echo "</td>";
					echo "<td align=center>";
 				    echo "<a href='add_data.php?ID=$a' class=X33>$a</a>";
					echo "</td>";

			         if($f == '' )
					 {
					    echo "<td align=left>";
					    echo "<a href='add_data.php?ID=$a' class=X33>&nbsp;&nbsp;$b&nbsp;&nbsp;</a>";
					     echo "</td>";
					 }
			         else if($f != '' )
					 {
					    echo "<td align=left>";
					    echo "<a href='add_data.php?ID=$a' class=X33>&nbsp;&nbsp;$b&nbsp;&nbsp;&nbsp;<IMG SRC=img/attach.png WIDTH='20' HEIGHT='15'  BORDER='0' ALT=''></a>";
					    echo "</td>";
					 }

                    // ชื่อกระทรวงมาให้ตรงกับรหัส
                    $sql_find_mini = "select * from mini where id_dep = '$c'";
                    $result_u = mysql_query($sql_find_mini);
                    while($row=mysql_fetch_array($result_u))
                    {
	                 	$x_id = trim(mysql_result($result_u,0,"id_dep"));
		                $x_name = trim(mysql_result($result_u,0,"dep_name"));
                    }
                   echo "<td align = left>";
 				   echo "<a href='add_data.php?ID=$a' class=X33>&nbsp;&nbsp;$x_name</a>";
                   echo "</td>";
				   echo "<td align=left>";
 				   echo "<a href='add_data.php?ID=$a' class=X33>&nbsp;&nbsp;$d</a>";
				   echo "</td>";
				   echo "<td align=left>";
 				   echo "<a href='add_data.php?ID=$a' class=X33>&nbsp;&nbsp;$e</a>";
				   echo "</td>";
				   echo "<td align=center><font class=X3>$g</td>";
				   echo "</tr>";
         }
echo "</table>";
echo "<table border = 0 cellpadding='1' cellspacing='0' style='border-collapse: collapse' width = 1000  bgcolor=#FF9900>";
echo "<tr height=40 bgcolor=#FFD553><td>";
echo "<font class=X3>&nbsp;&nbsp;&nbsp;&nbsp;"; 
echo "&nbsp;";
echo "&nbsp$Page&nbsp;&nbsp;";
$pages = new Paginator;
$pages->items_total = $rx;
$pages->mid_range = 10;
$pages->current_page = $Page;
$pages->default_ipp = $Per_Page;
$pages->url_next = $_SERVER["PHP_SELF"]."?QueryString=value&Page=";
$pages->paginate();
echo $pages->display_pages();
echo "</font>";
?>	
</td>
<td align=right><font class=X3></td></tr></table>