ค้นหาเจอ แบ่งหน้าถูกต้อง แต่กดเพจ Back กับ Next ไม่มีข้อมูลรบกวนด้วย

<?
include("include/connect.php");  
$date1 = "$_POST[yy1]-$_POST[mm1]-$_POST[dd1]";
$date2 = "$_POST[yy2]-$_POST[mm2]-$_POST[dd2]";
$strSQL = "SELECT * FROM nt_act WHERE date_act>='$date1' AND date_act<='$date2'";
$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
$Num_Rows = mysql_num_rows($objQuery);
 
$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($Num_Rows<=$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;
}
$strSQL .=" order by id_act DESC LIMIT $Page_Start , $Per_Page";
$objQuery  = mysql_query($strSQL);
    
while($objResult = mysql_fetch_array($objQuery))
   
{
?>
                  <br />
                  <b><font size="2">
                    <?=$objResult["date_act"];?>
                    </font></b>
                  <font size="2"> 
                    <a target="_blank" href="shownews.php?id_act=<?=$objResult["id_act"];?>"  title="" ><?=$objResult["name_act"];?><?=$objResult["image_name"];?></a>
                </font>             
                
       
<?
}
?>
<br>
Total <?= $Num_Rows;?> Numbers : <?=$Num_Pages;?> Page :

<?
if($Prev_Page)
{
echo " <a href='$_SERVER[SCRIPT_NAME]?Page=$Prev_Page'><< back</a> ";
}
 
for($i=1; $i<=$Num_Pages; $i++){
if($i != $Page)
{
echo "[ <a href='$_SERVER[SCRIPT_NAME]?Page=$i'>$i</a> ]";
}
else
{
echo "<b> $i </b>";
}
}
if($Page!=$Num_Pages)
{
echo " <a href ='$_SERVER[SCRIPT_NAME]?Page=$Next_Page&'>next>></a> ";
}

?>