[PG THEME] Thumbnails navigation

Hello,

I have currently a gallery that's running on my website with PG theme.
I would like to know if it's possible to set a navigation with page under the thumbnails like this :

[img]http://users.skynet.be/fa358153/12345.jpg[/img]

For example,

When I click on "1" I see the thumbnails #1 to #6
When I click on "2" I see the thumbnails #7 to #12
When I click on "3" I see the thumbnails #13 to #18

....etc....

I think I must edit this code that I have found in navigatorThumbs.tpl

<td width="50%" style="text-align:left">
{if ($first==1)}
<a href="{g->url params=$theme.navigator.first.urlParams}" onmouseover="firstpicMT.src='{$imageURL_on}firston.gif'" onmouseout="firstpicMT.src='{$imageURL}first.gif'">
<img name="firstpicMT" src="{$imageURL}first.gif" border="0" alt="{g->text text='first'}" title="{g->text text='first'}" longdesc="{g->text text='first'}" id="firstpicMT" class="icon"/></a>
{$theme.params.MTmoretext}
{/if}
</td>
<td style="text-align:right">
{if ($last==1)}
{$theme.params.MTmoretext}
<a href="{g->url params=$theme.navigator.last.urlParams}" onmouseover="lastpicMT.src='{$imageURL_on}laston.gif'" onmouseout="lastpicMT.src='{$imageURL}last.gif'">
<img name="lastpicMT" src="{$imageURL}last.gif" border="0" alt="{g->text text='last'}" title="{g->text text='last'}" longdesc="{g->text text='last'}" id="lastpicMT" class="icon"/></a>
{/if}
</td>

Thanks for your job and for your help...

Nicolas