Brand new to PHP - pagination help

[shepmom2002]

I am trying to display records from a database using pagination.  Currently the first page is showing and data is being displayed correctly.  The links are also available below to move from page to page, however when I click on the next page, nothing happens.  I know I need to add parameters to my query string, but I'm unsure as to what I need to add.  Can someone help?

 

Here is where I am calling the page:

 

<a href="index.php?menukey=7" accesskey="7" title="">Project 3</a>

 

Here is my pagination:

 

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
        $rs = @mysql_query($this->sql." LIMIT {$this->offset}, {$this->rows_per_page}");
        if(!$rs) {
            if($this->debug) echo "Pagination query failed. Check your query.<br />";
            return false;
        }
        return $rs;
    }
    
    /**
     * 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=' >>') {
        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='<<') {
        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.'?page='.$i.'">'.$i.'</a> ';
            }
        }
        
        return $links;
    }
    
    /**
     * Display full pagination navigation
     *
     * @access public
     * @return string
     */
    function renderFullNav() {
        return $this->renderFirst().' '.$this->renderPrev().' '.$this->renderNav().' '.$this->renderNext().' '.$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;