Problemer med paging

Jeg har nu i flere timer siddet og forsøgt at få mit paging til at virke, men må nu have lidt hjælp.

Min kode ser således ud:

<?php

$db = mysql_connect("localhost","brugernavn", "password");
mysql_select_db("database",$db);

$pager = new pager("SELECT * FROM test order by id DESC,10");
while($row = mysql_fetch_array($pager->result))

{

  print "<table>
        <tr>
            <td>
          <img src='$row[bigpic]'>
            </td>
            <td>
              <table>
                <tr>
                  <td><img src='$row[smallpic1]'><td>
                </tr>
              </table>
              <table>
                <tr>
                  <td><img src='$row[smallpic2]'><td>
                </tr>
              </table>
              <table>
                <tr>
                  <td><img src='$row[smallpic3]'><td>
                </tr>
              </table>
            </td>
            <td>
          <b>Videooplysninger</b><br><br>
          Spilletid:<br><b>$row[time]</b><br><br>
          Størrelse:<br><b>$row[storrelse] MB</b><br><br><br>
          <a href='$row[trymovie]'>Se prøvefilm</a><br><br>
          <a href='$row[link]'>Bliv medlem nu!</a>
            </td>
        </tr>
    </table><br>";

}
echo $pager->show();

class pager
{
    var $sql;
    var $getvar;
    var $rows;
    var $start;
    var $getvar_val;
    var $pager;
    var $result;

    function __construct($sql,$getvar,$length)
    {
        $this->result=null;
        $this->sql = $sql;
        $this->getvar = $getvar;
        $this->rows = 0;
        $this->start = 0;
        $this->getvar_val = 1;
        $this->pager = null;
        $this->SetLength($length);
        $this->GetStart();
        $this->doQuery();
    }

    //Sets $length
  function SetLength($length)
  {
      $this->length = (int)$length;
      if($this->length<0)
      {
          $this->length = 0;
      }
  }

  function doQuery()
  {
      $sql = trim($this->sql);
      $sql = substr($sql,6);
      $sql = 'SELECT SQL_CALC_FOUND_ROWS '.$sql.' limit '.$this->start.', '.$this->length;
      $this->result = mysql_query($sql);
      $sql = "SELECT FOUND_ROWS()";
      $result = mysql_query($sql);
      $this->rows = mysql_result($result,0);
  }

  //getvar_val() gets the
  //$getvar_val is a positive integer - > 0
  function Set_Getvar_val()
  {
      $this->getvar_val = (int)$_GET[$this->getvar];
      if($this->getvar_val<1)
      {
          $this->getvar_val = 1;
      }
  }

  //Gets the start of the data
  function GetStart()
  {
      $this->Set_Getvar_val();
      $this->start = (($this->getvar_val-1)*$this->length);
  }

    function show($next="Next",$last="Last",$separator=" ")
    {
        $array = $this->pager();
        $str = array();
        foreach($array as $k => $v)
        {
            if($k!='next'&&$k!='last')
            {
                if($k==$this->getvar_val)
                {
                    $str[] = $k;
                }
                else
                {
                    $str[] = '<a href="'.$v.'">'.$k.'</a>';
                }
            }
        }
        $str = implode($separator, $str);
        $rt = $array['last']===null?"":'<a href="'.$array['last'].'">'.$last.'</a>'.$separator;
        $rt .= $str.$separator;
        $rt .= $array['next']===null?"":'<a href="'.$array['next'].'">'.$next.'</a>';
        return $rt;
    }

    //Returns an array of the links arround the given point
    //['next'] => next page
    //['last'] => last page
    function pager($margin=10)
    {
        $path = $_GET;
        $newpath = $PHP_SELF."?";
        foreach($path as $key => $value)
        {
            if($key!=$this->getvar)
            {
                $newpath .= $key."=".$value;
                $newpath .="&";
            }
        }
        $newpath .= $this->getvar;

        $linkpaths = array();
        $current = $this->start / $this->length + 1;
        $pages = ceil(($this->rows/$this->length));
        $pagerstart = $current-$margin;
        $pagerstart = ($pagerstart<1)?1:$pagerstart;
        $pagerend = $current+$margin;

        $pagerend = ( $pagerend > $pages ) ? ( ceil( ( $this->rows / $this->length ) ) ): $pagerend;

        for($i=$pagerstart;$i < ($pagerend+1);$i++)
        {
            $linkpaths[$i] = $newpath."=".($i);
        }
        if($linkpaths[($current+1)]!=null)
        {
            $linkpaths['next']=$linkpaths[($current+1)];
        }
        if($linkpaths[($current-1)]!=null)
        {
            $linkpaths['last']=$linkpaths[($current-1)];
        }
        return $linkpaths;
    }
}
?>

Jeg får følgende fejl:

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /mounted-storage/home28a/sub002/sc25494-GAJW/www/sexsites/sexunion.dk/www/test/index2.php on line 8

Scriptet skulle gerne vise 10 på hver side.