Ecco il mio problema...

Codice PHP:
<? include ("connect_db.php");
$colonne=6;                                          if (($tipo == " ") && ($marca == " ")){
$count mysql_query("SELECT COUNT(id) FROM sb_mod where attivo='1' order by id desc");}                                          elseif (($tipo != " ") && ($marca == " ")){
$count mysql_query("SELECT COUNT(id) FROM sb_mod where tipo='$tipo' and attivo='1' order by id desc");}                                          elseif (($tipo == " ") && ($marca != " ")){
$count mysql_query("SELECT COUNT(id) FROM sb_mod where marca='$marca' and attivo='1' order by id desc");}                                          elseif (($tipo != " ") && ($marca != " ")){
$count mysql_query("SELECT COUNT(id) FROM sb_mod where tipo='$tipo' and marca='$marca' and attivo='1' order by id desc");}                                          $res_count mysql_fetch_row($count);
// numero totale di records                                          $tot_records = $res_count[0];
// risultati per pagina(secondo parametro di LIMIT)                                          $per_page = 30;
// numero totale di pagine                                          $tot_pages = ceil($tot_records / $per_page);
// pagina corrente                                          $current_page = (!$_GET['page']) ? 1 : (int)$_GET['page'];
// primo parametro di LIMIT                                          $primo = ($current_page - 1) * $per_page;
// esecuzione seconda query con LIMIT                                          if (($tipo == " ") && ($marca == " ")){
$query_limit "SELECT * FROM sb_mod where attivo='1' LIMIT $primo$per_page";}                                          if (($tipo != " ") && ($marca == " ")){
$query_limit "SELECT * FROM sb_mod where tipo='$tipo' and attivo='1' LIMIT $primo$per_page";}                                          if (($tipo == " ") && ($marca != " ")){
$query_limit "SELECT * FROM sb_mod where marca='$marca' and attivo='1' LIMIT $primo$per_page";}                                          if (($tipo != " ") && ($marca != " ")){
$query_limit "SELECT * FROM sb_mod where tipo='$tipo' and marca='$marca' and attivo='1' LIMIT $primo$per_page";}                                          $res = @mysql_query($query_limit);                                          $righe = @mysql_num_rows($res); ?>                                          <tr>                                              <td align="center" height="25px" width="100%">                                                  <table cellpadding="0" cellspacing="0" width="100%" align="left">                                                      <tr>                                                          <td width="100%"><?                                                          if(($righe = @mysql_num_rows($res)) == 0){
echo 
"<table cellpadding=\"2\" cellspacing=\"0\" width=\"100%\"                                                                      <tr>                                                                          <td valign=\"top\" class=\"testo1\" colspan=\"2\">La ricerca non ha trovato articoli.</td>                                                                      </tr>                                                                  <tr><td height=\"230\"></td></tr>                                                              </table>";}                                                                                                                    if(($righe = @mysql_num_rows($res))> 0){ ?>                                                              <table cellpadding="0" cellspacing="0" width="100%">                                                              <?                                                              for($v 0$v $righe$v++) {
$r = @mysql_fetch_array($res);                                                              $testo=split(" "$r[nome_mod]);                                                              if($v $colonne == 0){?>                                                                  <tr>                                                                  <? ?>                                                                      <td valign="top" width="100px">                                                                          <table width="100%" cellpadding="0" cellspacing="0">                                                                              <tr>                                                                                  <td width="100%" valign="top" align="left">                                                                                      <table width="100%" cellpadding="0" cellspacing="0"><?                                                                                       $result mysql_query("select * from sb_fotomod where id_mod='$r[id]' and sel='1'");                                                                                      $num_rows mysql_num_rows($result);                                                                                      $queryfoto "select * from sb_fotomod where id_mod='$r[id]' and sel='1'";                                                                                      $resultfoto mysql_query($queryfoto);                                                                                      $f=0;                                                                                      $foto=mysql_result($resultfoto,$f,"foto");                                                                                      echo "<tr><td><a href=\"scheda.php?id=$r[id]\" target=\"_self\" class=\"border\"><img src=\"resize.php?maxx=120&maxy=85&src=http://www.calcionetwork.it/sorellebeltrame/admin/modelli/images/fotomodelli/$foto\"></a></td></tr>                                                                                          <tr>                                                                                              <td>                                                                                                  <table cellpadding=\"3\" cellspacing=\"0\" width=\"100%\" bgcolor=\"#666666\">                                                                                                      <tr>                                                                                                          <td class=\"testo8\" align=\"left\" width=\"25%\">Tipologia:</td>                                                                                                          <td class=\"testo8\" align=\"left\">$r[tipo]</td>                                                                                                      </tr>                                                                                                      <tr>                                                                                                          <td class=\"testo8\" align=\"left\">Marca:</td>                                                                                                          <td class=\"testo8\" align=\"left\">$r[marca]</td>                                                                                                      </tr>                                                                                                      <tr>                                                                                                          <td class=\"testo8\" align=\"left\">Modello:</td>                                                                                                          <td class=\"testo8\" align=\"left\">$testo[0]".$testo[1]"." ..</td>                                                                                                      </tr>                                                                                                  </table>                                                                                              </td>                                                                                          </tr>";                                                                                      ?>                                                                                      </table>                                                                                    </td>                                                                              </tr>                                                                                <tr>                                                                                  <td height="30px" width="100%" colspan="3"></td>                                                                                </tr>                                                                          </table>                                                                          <?                                                                           if(($v $colonne) == ($colonne 1) || ($v 1) == $righe){
echo 
"<table><tr><td></td></tr></table>";}
?>                                                                      </td>                                                                  </tr>                                                                  <tr><td colspan="6"><hr class="hr" /></td></tr>                                                              </table>                                                              <? }                                                               // includiamo uno dei files contenenti la paginazione, commentate l'altro ovviamente                                                              //include("paginazione_1.php");                                                              include("paginazione_2.php");                                                              // in questa cella inseriamo la paginazione                                                              echo " <table cellpadding=\"0\" cellspacing=\"0\" width=\"100%\"><tr>\n <td valign=\"top\" align=\"left\" class=\"testo2\" colspan=\"7\" width=\"100%\">$paginazione</td>\n";                                                              echo " <tr><table>";
mysql_close();  ?>
Le ricerce vengono effettuate bene e pure la restituzione dei valori nella prima pagina..Se passo alla seconda pagina mi viene scritto "La ricerca non ha trovato articoli." ... Non so se è un problema legato ai 4+4 IF iniziali, o ad altro..
Non so piu come andar avanti, le ho provate tutte veramente..Grazie mille se qualcuno mi potrà consigliare..