รบกวนช่วยดู Paging/Pagination หน่อยครับ มันกด previous แล้วกลับไปหน้าแรกเลย มันไม่กลับไปหน้าก่อนหน้า

<div class="mainContent">
        <?
			$ID = $_GET['ID'];
			$sql = "SELECT * FROM culture ";
			$objQuery = mysql_query($sql) or die ("Error Query [".$sql."]");
			$Num_Rows = mysql_num_rows($objQuery);
			
			$Per_Page = 4;   // 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 ID ASC LIMIT $Page_Start , $Per_Page";
			$objQuery  = mysql_query($sql);
			?>
                	<article class="header">
						<header>
                            <h2><a href="#" title="วัฒนธรรม">วัฒนธรรม</a></h2>
                        </header>
                    </article>
			<?
			while($objResult = mysql_fetch_array($objQuery))
			{
				?>
                <div class="content2">
                <article class="topcontent-left">
                        <footer>
                        	<h3><p class="post-info"><?=$objResult["name"];?></p></h3>
                        </footer>
    
                        <content>
                            <p><a href="culture_detail.php"=<?=$objResult["ID"];?>"><img src="admin/img_culture/<?=$objResult["img"];?>">"</a></p>
                            <p class="post-info"><?=$objResult["detail"];?></p>
                    	</content>
                </article>
                </div>
                <?
                }
                ?>
		</div>
		
     <footer class="mainPage">
    	<p align="center">				
			Total <?php echo $Num_Rows;?> Record <br>
			<?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()
			?>
       </p>
    </footer>

<?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 = 5;
		$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($this->num_pages >1)
		{
			//$this->return = "<a class=\"paginate\" href=\"".$this->url_next."1\">First Page</a> ";

			$this->return .= ($this->current_page != 1 And $this->items_total >= 1) ? "<a class=\"paginate\" href=\"".$this->url_next."1\">First Page</a> ":"<span class=\"inactive\" href=\"#\">&laquo; First Page</span> ";
			
			$this->return .= ($this->current_page != 1 And $this->items_total >= 1) ? "<a class=\"paginate\" href=\"".$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 $this->items_total >= 1) And ($_GET['Page'] != 'All')) ? "<a class=\"paginate\" href=\"".$this->url_next.$next_page."\">Next &raquo;</a>\n":"<span class=\"inactive\" href=\"#\">&raquo; Next</span>\n";

			$this->return .= (($this->current_page != $this->num_pages And $this->items_total >= 1) And ($_GET['Page'] != 'All')) ? "<a class=\"paginate\" href=\"".$this->url_next.$this->num_pages."\">Last Page</a\n":"<span class=\"inactive\" href=\"#\">&raquo; Last Page</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;
	}
}
?>