<?xml version="1.0" encoding="UTF-8"?>
<modification>
<id><![CDATA[Change Big Product image on hover of thumbnial images]]></id>
<version><![CDATA[1.0]]></version>
<vqmver><![CDATA[2.X]]></vqmver>
<author><![CDATA[opencartforum.com]]></author>
<file name="catalog/view/theme/*/template/product/product.tpl">
<operation error="log">
<search position="before"><![CDATA[<div id="content">]]>
</search>
<add><![CDATA[
<script type="text/javascript">
jQuery(document).ready(function() {
$(".left .image-additional a").hover(function(){
var img=this.href;
$(".left .image a").attr('href',img);
var profileimage=$(".left .image a img");
profileimage.css({"width":"<?php echo $this->config->get('config_image_thumb_height'); ?>","height":"<?php echo $this->config->get('config_image_thumb_height'); ?>"});
profileimage.attr('src',img);
});
});
</script>
]]></add>
</operation>
</file>
</modification>
Всё это упаковать в XML ( change-image-on-hover-thumbnial.xml ) или ручками добавить.