jqZoom on only one product of the website

[skywhi]

Hello, I want only one of my products on the website use jqZoom and the others use the fancybox. So I activate the jqZoom in the back office and I then added this line in my product.tpl :

{if $have_image}
<span id="view_full_size">
{if $jqZoomEnabled && $have_image && !$content_only && $product->id == 146}
<a class="jqzoom" title="{if !empty($cover.legend)}{$cover.legend|escape:'html':'UTF-8'}{else}{$product->name|escape:'html':'UTF-8'}{/if}" rel="gal1" href="{$link->getImageLink($product->link_rewrite, $cover.id_image, 'thickbox_default')|escape:'html':'UTF-8'}">
<img itemprop="image" src="{$link->getImageLink($product->link_rewrite, $cover.id_image, 'large_default')|escape:'html':'UTF-8'}" title="{if !empty($cover.legend)}{$cover.legend|escape:'html':'UTF-8'}{else}{$product->name|escape:'html':'UTF-8'}{/if}" alt="{if !empty($cover.legend)}{$cover.legend|escape:'html':'UTF-8'}{else}{$product->name|escape:'html':'UTF-8'}{/if}"/>
</a>
{else}
<img id="bigpic" class="img-rack-png" itemprop="image" src="{$link->getImageLink($product->link_rewrite, $cover.id_image, 'large_default')|escape:'html':'UTF-8'}" title="{if !empty($cover.legend)}{$cover.legend|escape:'html':'UTF-8'}{else}{$product->name|escape:'html':'UTF-8'}{/if}" alt="{if !empty($cover.legend)}{$cover.legend|escape:'html':'UTF-8'}{else}{$product->name|escape:'html':'UTF-8'}{/if}" width="{$largeSize.width}" height="{$largeSize.height}"/>
{if !$content_only}
<span class="zoomPhoto no-print"><i class="icon-search"></i></span>
{/if}
{/if}
</span>
{else}
<span id="view_full_size">
<img itemprop="image" src="{$img_prod_dir}{$lang_iso}-default-large_default.jpg" id="bigpic" alt="" title="{$product->name|escape:'html':'UTF-8'}" width="670" height="640"/>
</span>
{/if}

It works on the product in question that zooms with jqZoom. But when I go on another product that has declinations and I click on my dropdown on one of it, it automatically opens the fancybox to zoom the declination. How to fix that ? Thanks in advance !