ต้องการส่งค่า GET(ค้าหา) ไปพร้อมกับการเลือกหน้าแบบหลายหน้า ตอนนี้ติดปัญหาครับ

<?php   
	session_start();
include "chksession.php"; 
include "../../include/connect.php";


class Paginator{
	var $items_per_page;
	var $items_total;
	var $current_page;
	var $num_pages;
	var $mid_range;
	var $low;
	var $high;
	var $limit;
	var $return;
	var $default_ipp;
	var $querystring;
	var $url_next;

	function Paginator()
	{
		$this->current_page = 1;
		$this->mid_range = 7;
		$this->items_per_page = $this->default_ipp;
		$this->url_next = $this->url_next;
	}
	function paginate()
	{

		if(!is_numeric($this->items_per_page) OR $this->items_per_page <= 0) $this->items_per_page = $this->default_ipp;
		$this->num_pages = ceil($this->items_total/$this->items_per_page);

		if($this->current_page < 1 Or !is_numeric($this->current_page)) $this->current_page = 1;
		if($this->current_page > $this->num_pages) $this->current_page = $this->num_pages;
		$prev_page = $this->current_page-1;
		$next_page = $this->current_page+1;


		if($this->num_pages > 10)
		{
			$this->return = ($this->current_page != 1 And $this->items_total >= 10) ? "<a class=\"paginate\" href=\"".$this->url_next.$this->$prev_page."\">&laquo; Previous</a> ":"<span class=\"inactive\" href=\"#\">&laquo; Previous</span> ";

			$this->start_range = $this->current_page - floor($this->mid_range/2);
			$this->end_range = $this->current_page + floor($this->mid_range/2);

			if($this->start_range <= 0)
			{
				$this->end_range += abs($this->start_range)+1;
				$this->start_range = 1;
			}
			if($this->end_range > $this->num_pages)
			{
				$this->start_range -= $this->end_range-$this->num_pages;
				$this->end_range = $this->num_pages;
			}
			$this->range = range($this->start_range,$this->end_range);

			for($i=1;$i<=$this->num_pages;$i++)
			{
				if($this->range[0] > 2 And $i == $this->range[0]) $this->return .= " ... ";
				if($i==1 Or $i==$this->num_pages Or in_array($i,$this->range))
				{
					$this->return .= ($i == $this->current_page And $_GET['Page'] != 'All') ? "<a title=\"Go to page $i of $this->num_pages\" class=\"current\" href=\"#\">$i</a> ":"<a class=\"paginate\" title=\"Go to page $i of $this->num_pages\" href=\"".$this->url_next.$i."\">$i</a> ";
				}
				if($this->range[$this->mid_range-1] < $this->num_pages-1 And $i == $this->range[$this->mid_range-1]) $this->return .= " ... ";
			}
			$this->return .= (($this->current_page != $this->num_pages And $this->items_total >= 10) And ($_GET['Page'] != 'All')) ? "<a class=\"paginate\" href=\"".$this->url_next.$next_page."\">Next &raquo;</a>\n":"<span class=\"inactive\" href=\"#\">&raquo; Next</span>\n";
		}
		else
		{
			for($i=1;$i<=$this->num_pages;$i++)
			{
				$this->return .= ($i == $this->current_page) ? "<a class=\"current\" href=\"#\">$i</a> ":"<a class=\"paginate\" href=\"".$this->url_next.$i."\">$i</a> ";
			}
		}
		$this->low = ($this->current_page-1) * $this->items_per_page;
		$this->high = ($_GET['ipp'] == 'All') ? $this->items_total:($this->current_page * $this->items_per_page)-1;
		$this->limit = ($_GET['ipp'] == 'All') ? "":" LIMIT $this->low,$this->items_per_page";
	}

	function display_pages()
	{
		return $this->return;
	}
}

$dep_id=$_GET["dep_id"];

$unit_id=$_GET["unit_id"];

		$sql="SELECT * FROM tb_office o INNER JOIN tb_office_material om ON om.office_id=o.ref_office_id INNER JOIN tb_unit u ON u.unit_id=o.ref_unit_id INNER JOIN tb_office_amount oa ON oa.ref_of_id=o.office_id_full";
		if(!empty($dep_id)){
			
			$sql.=" AND o.ref_office_id='".$dep_id."' ";
		}if(!empty($unit_id)){
			$sql.=" AND o.ref_unit_id='".$unit_id."' ";
		}
		

	
	$result=mysql_db_query($dbname,$sql) or die(mysql_error() . "<br />" . $sql);
	
	$Num_Rows = mysql_num_rows($result);
	
	$Per_Page = 10;   // 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;
	}

	$sql.=" ORDER BY o.office_id_full ASC LIMIT $Page_Start , $Per_Page";

	$result=mysql_db_query($dbname,$sql) or die(mysql_error() . "<br />" . $sql);
	
	$n=1;
	$no=0;
	if($Page > 1)
		{
			$no = $Per_Page * $Page;
		}
	
	
?>

<?php

$pages = new Paginator;
$pages->items_total = $Num_Rows;
$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()
?>	

Total <?php echo $Num_Rows;?> Record : <?php echo $Num_Pages;?> Page :
<?php
if($Prev_Page)
{
	echo " <a href='$_SERVER[SCRIPT_NAME]?Page=$Prev_Page&dep_id=$dep_id&unit_id=$unit_id'><< Back</a> ";
}

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