error in paginating custom table in wordpress

Question

As the title says, I have this code for a custom table with pagination. But my error is that it is not redirecting to paged number(always result of page 1). My code is:

add_filter( 'the_content', 'get_scrapy_scraped' );

function get_scrapy_scraped( $content )
{
include_once('paginator.class.php');

    global $wpdb;

    if ( ! is_page( 'jobs' ) ) //when jobs is read
        return $content;
        $query = "SELECT COUNT(*) FROM wp_careers";
$result = mysql_query($query) or die(mysql_error());
$num_rows = mysql_fetch_row($result);

$pages = new Paginator;
$pages->items_total = $num_rows[0];
$pages->mid_range = 9; // Number of pages to display. Must be odd and > 3
$pages->paginate();

echo $pages->display_pages();
echo "<span class=\"\">".$pages->display_jump_menu().$pages->display_items_per_page()."</span>";

$query = "SELECT * FROM wp_careers ORDER BY Job_Name ASC $pages->limit";
$result = mysql_query($query) or die(mysql_error());

echo "<table>";
echo "<tr><th>Job Name</th><th>Department/Location</th><th>Information</th><th>Apply Links</th></tr>";
while($row = mysql_fetch_row($result))
{
    echo "<tr><td>$row[3]</td><td>$row[1]</td><td>$row[0]</td><td>$row[2]</td></tr>\n";

}
echo "</table>";

echo $pages->display_pages();
echo "<p>Page: $pages->current_page of $pages->num_pages</p>\n";
echo "<p>SELECT * FROM table $pages->limit (retrieve records $pages->low-$pages->high from table - $pages->items_total item total / $pages->items_per_page items per page)";
}

and paginator.class.php is:

        <?php


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

    function Paginator()
    {
        $this->current_page = 1;
        $this->mid_range = 7;
        $this->ipp_array = array(10,25,50,100,'All');
        $this->items_per_page = (!empty($_GET['ipp'])) ? $_GET['ipp']:$this->default_ipp;
    }

    function paginate()
    {
        if(!isset($this->default_ipp)) $this->default_ipp=25;
        if($_GET['ipp'] == 'All')
        {
            $this->num_pages = 1;
//          $this->items_per_page = $this->default_ipp;
        }
        else
        {
            if(!is_numeric($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);
        }
        $this->current_page = (isset($_GET['page'])) ? (int) $_GET['page'] : 1 ; // must be numeric > 0
        $prev_page = $this->current_page-1;
        $next_page = $this->current_page+1;
        if($_GET)
        {
            $args = explode("&",$_SERVER['QUERY_STRING']);
            foreach($args as $arg)
            {
                $keyval = explode("=",$arg);
                if($keyval[0] != "pg" And $keyval[0] != "ipp") $this->querystring .= "&" . $arg;
            }
        }

        if($_POST)
        {
            foreach($_POST as $key=>$val)
            {
                if($key != "page" And $key != "ipp") $this->querystring .= "&$key=$val";
            }
        }
        if($this->num_pages > 10)
        {
            $this->return = ($this->current_page > 1 And $this->items_total >= 10) ? "<a class=\"paginate\" href=\"?page=wp-retrieve-database&page=$i&ipp=$this->items_per_page$this->querystring\">&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]) $this->return .= " ... ";
                // loop through all pages. if first, last, or in range, display
                if($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 $this->num_pages\" href=\"?page=$i&ipp=$this->items_per_page$this->querystring\">$i</a> ";
                }
                if($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') And $this->current_page > 0) ? "<a class=\"paginate\" href=\"?page=$next_page&ipp=$this->items_per_page$this->querystring\">Next &raquo;</a>\n":"<span class=\"inactive\" href=\"#\">&raquo; Next</span>\n";
            $this->return .= ($_GET['page'] == 'All') ? "<a class=\"current\" style=\"margin-left:10px\" href=\"#\">All</a> \n":"<a class=\"paginate\" style=\"margin-left:10px\" href=\"?page=1&ipp=All$this->querystring\">All</a> \n";
        }
        else
        {
            for($i=1;$i<=$this->num_pages;$i++)
            {
                $this->return .= ($i == $this->current_page) ? "<a class=\"current\" href=\"#\">$i</a> ":"<a class=\"paginate\" href=\"?page=$i&ipp=$this->items_per_page$this->querystring\">$i</a> ";
            }
            $this->return .= "<a class=\"paginate\" href=\"?page=1&ipp=All$this->querystring\">All</a> \n";
        }
        $this->low = ($this->current_page <= 0) ? 0:($this->current_page-1) * $this->items_per_page;
        if($this->current_page <= 0) $this->items_per_page = 0;
        $this->limit = ($_GET['ipp'] == 'All') ? "":" LIMIT $this->low,$this->items_per_page";
    }
    function display_items_per_page()
    {
        $items = '';
        if(!isset($_GET[ipp])) $this->items_per_page = $this->default_ipp;
        foreach($this->ipp_array as $ipp_opt) $items .= ($ipp_opt == $this->items_per_page) ? "<option selected value=\"$ipp_opt\">$ipp_opt</option>\n":"<option value=\"$ipp_opt\">$ipp_opt</option>\n";
        return "<span class=\"paginate\">Items per page:</span><select class=\"paginate\" onchange=\"window.location='?page=1&ipp='+this[this.selectedIndex].value+'$this->querystring';return false\">$items</select>\n";
    }
    function display_jump_menu()
    {
        for($i=1;$i<=$this->num_pages;$i++)
        {
            $option .= ($i==$this->current_page) ? "<option value=\"$i\" selected>$i</option>\n":"<option value=\"$i\">$i</option>\n";
        }
        return "<span class=\"paginate\">Page:</span><select class=\"paginate\" onchange=\"window.location='?page='+this[this.selectedIndex].value+'&ipp=$this->items_per_page$this->querystring';return false\">$option</select>\n";
    }
    function display_pages()
    {
        return $this->return;
    }
}

which is from http://www.catchmyfame.com/2007/07/28/finally-the-simple-pagination-class/ I hope someone can help! Tnx in advance