PHP Pagination wont work with menu keys

I have an issue. My pagination works correct with the alone paginate_customers.php page. It skips along each page without issue. Now since I have added the paginate_customers.php to my index page as a "/index.php?menukey=10" when I go to page 2 of the paginate_customers.php page it does not go, it just refreshes the page to page 1 of the paginate_customers.php page. How can I fix this?
I will add the code below of the ps_pagination. php and the paginate_customers.php page that is displayed on the website. Any suggestions will help, thanks!

<?php


class PS_Pagination {
	var $php_self;
	var $rows_per_page; //Number of records to display per page
	var $total_rows; //Total number of rows returned by the query
	var $links_per_page; //Number of links to display per page
	var $sql;
	var $debug = false;
	var $conn;
	var $page;
	var $max_pages;
	var $offset;
	
	/**
	 * Constructor
	 *
	 * @param resource $connection Mysql connection link
	 * @param string $sql SQL query to paginate. Example : SELECT * FROM users
	 * @param integer $rows_per_page Number of records to display per page. Defaults to 10
	 * @param integer $links_per_page Number of links to display per page. Defaults to 5
	 */
	 
	function PS_Pagination($connection, $sql, $rows_per_page = 10, $links_per_page = 5) {
		$this->conn = $connection;
		$this->sql = $sql;
		$this->rows_per_page = $rows_per_page;
		$this->links_per_page = $links_per_page;
		$this->php_self = htmlspecialchars($_SERVER['PHP_SELF']);
		if(isset($_GET['page'])) {
			$this->page = intval($_GET['page']);
		}
	}
	
	/**
	 * Executes the SQL query and initializes internal variables
	 *
	 * @access public
	 * @return resource
	 */
	function paginate() {
		if(!$this->conn) {
			if($this->debug) echo "MySQL connection missing<br />";
			return false;
		}
		
		$all_rs = @mysql_query($this->sql);
		if(!$all_rs) {
			if($this->debug) echo "SQL query failed. Check your query.<br />";
			return false;
		}
		$this->total_rows = mysql_num_rows($all_rs);
		@mysql_close($all_rs);
		
		$this->max_pages = ceil($this->total_rows/$this->rows_per_page);
		//Check the page value just in case someone is trying to input an aribitrary value
		if($this->page > $this->max_pages || $this->page <= 0) {
			$this->page = 1;
		}
		
		//Calculate Offset
		$this->offset = $this->rows_per_page * ($this->page-1);
		
		//Fetch the required result set
		$res = @mysql_query($this->sql." LIMIT {$this->offset}, {$this->rows_per_page}");
		if(!$res) {
			if($this->debug) echo "Pagination query failed. Check your query.<br />";
			return false;
		}
		return $res;
	}
	
	/**
	 * Display the link to the first page
	 *
	 * @access public
	 * @param string $tag Text string to be displayed as the link. Defaults to 'First'
	 * @return string
	 */
	function renderFirst($tag='First') {
		if($this->page == 1) {
			return $tag;
		}
		else {
			return '<a href="'.$this->php_self.'?page=1">'.$tag.'</a>';
		}
	}
	
	/**
	 * Display the link to the last page
	 *
	 * @access public
	 * @param string $tag Text string to be displayed as the link. Defaults to 'Last'
	 * @return string
	 */
	function renderLast($tag='Last') {
		if($this->page == $this->max_pages) {
			return $tag;
		}
		else {
			return '<a href="'.$this->php_self.'?page='.$this->max_pages.'">'.$tag.'</a>';
		}
	}
	
	/**
	 * Display the next link
	 *
	 * @access public
	 * @param string $tag Text string to be displayed as the link. Defaults to '>>'
	 * @return string
	 */
	function renderNext($tag=' &gt;&gt;') {
		if($this->page < $this->max_pages) {
			return '<a href="'.$this->php_self.'?page='.($this->page+1).'">'.$tag.'</a>';
		}
		else {
			return $tag;
		}
	}
	
	/**
	 * Display the previous link
	 *
	 * @access public
	 * @param string $tag Text string to be displayed as the link. Defaults to '<<'
	 * @return string
	 */
	function renderPrev($tag='&lt;&lt;') {
		if($this->page > 1) {
			return '<a href="'.$this->php_self.'?page='.($this->page-1).'">'.$tag.'</a>';
		}
		else {
			return $tag;
		}
	}
	
	/**
	 * Display the page links
	 *
	 * @access public
	 * @return string
	 */
	function renderNav() {
		for($i=1;$i<=$this->max_pages;$i+=$this->links_per_page) {
			if($this->page >= $i) {
				$start = $i;
			}
		}
		
		if($this->max_pages > $this->links_per_page) {
			$end = $start+$this->links_per_page;
			if($end > $this->max_pages) $end = $this->max_pages+1;
		}
		else {
			$end = $this->max_pages;
		}
			
		$links = '';
		
		for( $i=$start ; $i<$end ; $i++) {
			if($i == $this->page) {
				$links .= " $i ";
			}
			else {
				$links .= ' <a href="'.$this->php_self.'?menukey=10?page='.$i.'">'.$i.'</a> ';
			}
		}
		
		return $links;
	}
	
	/**
	 * Display full pagination navigation
	 *
	 * @access public
	 * @return string
	 */
	function renderFullNav() {
		return $this->renderFirst().'&nbsp;'.$this->renderPrev().'&nbsp;'.$this->renderNav().'&nbsp;'.$this->renderNext().'&nbsp;'.$this->renderLast();	
	}
	
	/**
	 * Set debug mode
	 *
	 * @access public
	 * @param bool $debug Set to TRUE to enable debug messages
	 * @return void
	 */
	function setDebug($debug) {
		$this->debug = $debug;
	}
}
?>


/********************paginate_customers.php*************/

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
	<meta http-equiv="content-type" content="text/html; charset=utf-8" />
	<meta name="keywords" content="" />
	<meta name="description" content="" />
	<!-- <link href="default.css" rel="stylesheet" type="text/css" /> -->
</head>
<body>

<?php
    //Include the PS_Pagination class
	include('ps_pagination.php');
	require_once ('mysqli_connect.php');
	
	
	
	//Connect to mysql db
	$conn = mysql_connect('localhost', 'corporatekeenan', 'eeee');
	mysql_select_db('okok',$conn);
	$sql = 'SELECT * FROM customers ORDER by CustomerID';

	
    //Create a PS_Pagination object
	$countperpage = 25;
	$pager = new PS_Pagination($conn,$sql,$countperpage,7);
	
    //The paginate() function returns a mysql result set 
	$res = $pager->paginate();
	echo '<table align="center" cellspacing="0" cellpadding="0" border=1>
		<tr>
			<td align="left" colspan="13"><h1>Customers:</h1></td>
		</tr>
		<tr>
			<td>CustomerID</td>
			<td>OldCustomerID</td>
			<td>Customer First</td>
			<td>Customer Middle</td>
			<td>Customer Last</td>
			<td>Username</td>
			<td>Car</td>
			<td>Car Color</td>
			<td>Computer</td>
			<td>Laptop (yes/no)</td>
			<td>Race</td>
			<td>Residence</td>
			<td>Birth Month</td>
		</tr>';

		while($row = mysql_fetch_assoc($res)) {
			echo '<tr><td>' . $row['CustomerID'] . '</td><td>' . $row['OldCustomerID'] . '</td><td>' . $row['FirstName'] . '</td><td>' . $row['MiddleName'] . '</td><td>' .  $row['LastName'] . '</td><td>' . $row['Username'] . '&nbsp;</td><td>' . $row['CarID'] . '</td><td>' . $row['CarColorID'] . '</td><td>' . $row['ComputerID'] . '</td><td>' . $row['IsLaptop'] . '</td><td>' . $row['RaceID'] . '</td><td>' . $row['ResidenceID'] . '</td><td>' . $row['BirthMonthID'] . '</td></tr>';
		   }
			echo '</table>';

	
    //Display the full navigation in one go
	echo "<br><center><font face=verdana size=3 color=green>";
	echo $pager->renderFullNav();
	echo "</font></center>";

	mysql_free_result($res);
	mysql_close($conn);



/*	Or you can display the inidividual links... */
	   // echo $pager->renderFirst();			//Display the link to first page: First
	    //echo $pager->renderPrev();			//Display the link to previous page: <<
	    //echo $pager->renderNav();			//Display page links: 1 2 3
	    //echo $pager->renderNext();			//Display the link to next page: >>
	    //echo $pager->renderLast();			//Display the link to last page: Last


?>

</body>
</html>

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