category.php
$this->data['products'][] = array(
'name' => $result['name'],
'model' => $result['model'],
'rating' => $rating,
'stars' => sprintf($this->language->get('text_stars'), $rating),
'thumb' => $this->model_tool_image->resize($image, $this->config->get('config_image_product_width'), $this->config->get('config_image_product_height')),
'popup' => $this->model_tool_image->resize($image, $this->config->get('config_image_popup_width'), $this->config->get('config_image_popup_height')),
'price' => $price,
'options' => $options,
'special' => $special,
'href' => $this->model_tool_seo_url->rewrite(HTTP_SERVER . 'index.php?route=product/product&path=' . $this->request->get['path'] . '&product_id=' . $result['product_id']),
'add' => $add
);
category.tpl
<a href="<?php echo $products[$j]['popup']; ?>" title="<?php echo $products[$j]['name']; ?>" rel="slideshow" rel="gallery">
<img src="<?php echo $products[$j]['thumb']; ?>" title="<?php echo $products[$j]['name']; ?>" alt="<?php echo $products[$j]['name']; ?>" id="image" style="margin-bottom: 3px;" />
</a>
у меня с такими изменениями все работает.