ช่วยดูโค้ดแบ่งหน้าหน่อยคับ หน้าแรกเปิดได้ แต่พอหน้าต่อไปกดแล้วมันไม่เจอข้อมูลอะคับ

<form name="frmSearch" method="get" action="<?=$_SERVER['SCRIPT_NAME'];?>">
<SELECT NAME="txtKeyword" size="1" id="txtKeyword" value="<?=$_GET["txtKeyword"];?>">
<?php
	$strSQL = "SELECT [Tbl DesingISO DwgRevise].[Iso No] FROM [Tbl DesingISO DwgRevise] Group By [Iso No]";
	$objExec = odbc_exec($objConnect, $strSQL) or die ("Error Execute [".$strSQL."]");

	while($result = odbc_fetch_array($objExec)){
			$i = $result["Iso No"];
			echo"<OPTION VALUE='$i'>$i</OPTION>";
	}
?>
</SELECT>
<INPUT TYPE="submit" value='Search'>
</form>
</td>
<td>
<!-- คีย์ข้อมูลค้นหาเอง -->
<form name="frmSearch" method="get" action="<?=$_SERVER['SCRIPT_NAME'];?>">
<INPUT TYPE="text" NAME="txtKeyword" size='15'>
<INPUT TYPE="submit" value='Search'>
</form>
</td>
</table>
<?
if($_GET["txtKeyword"] != ""){
$strSQL = "SELECT  * FROM [Tbl DesingISO DwgRevise]  WHERE ([Iso No] LIKE '%".$_GET["txtKeyword"]."%')";
$objExec = odbc_exec($objConnect, $strSQL) or die ("Error Execute [".$strSQL."]");

$Num_Rows = 0;
while(odbc_fetch_row($objExec)){$Num_Rows++;} // Count Record

$Per_Page = 20;   // 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)+1;
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;
}
$Page_End = $Per_Page * $Page;
if($Page_End > $Num_Rows)
{
	$Page_End = $Num_Rows;
}

?>
<table width="100%" class='tbSearch'>
<tr>
<th width="75"> <div align="center">FWDrawingno</div></th>
<th width="70"> <div align="center">Iso No</div></th>
<th width="50"> <div align="center">For</div></th>
<th width="50"> <div align="center">DSN</div></th>
<th width="70"> <div align="center">Trans No</div></th>
<th width="40"> <div align="center">FW Rev</div></th>
<th width="68"> <div align="center">DateRev</div></th>
<th width="33"> <div align="center">Edit</div></th>
<th width="33"> <div align="center">Delete</div></th>
</tr>

<?

//while($objResult = odbc_fetch_array($objExec)){

for($i=$Page_Start;$i<=$Page_End;$i++){
	$objResult = odbc_fetch_array($objExec,$i);

		$g += 1; 
		$a=$g%2;
		if($a==0){$bg='#CCFFFF';}else{$bg='#E6DFF2';}
?>
<tr bgcolor="<? echo $bg ?>">
<td><div align="center"><?=$objResult["FWDrawingno"];?></div></td>
<td><div align="center"><?=$objResult["Iso No"];?></div></td>
<td><div align="center"><?=$objResult["For"];?></div></td>
<td><div align="center"><?=$objResult["DSN"];?></div></td>
<td><div align="center"><?=$objResult["Trans No"];?></div></td>
<td><div align="center"><?=$objResult["FW Rev"];?></div></td>
<td><div align="center"><?=$objResult["DateRev"];?></div></td>
<td><div align="center">Edit</div></td>
<td><div align="center">Delete</div></td>
</tr>
<?
//}
}
?>
</table>
<br>
Total <?= $Num_Rows;?> Record : <?=$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=$Next_Page'> Next>></a> ";
}
odbc_close($objConnect);
}
else{

	echo"Not found data";
}
?>