<script type="text/javascript" src="{$base_dir_ssl}themes/prestashop/js/jquery.jqzoom-core.js"></script>
<link href="{$base_dir_ssl}themes/prestashop/css/jquery.jqzoom.css" rel="stylesheet" type="text/css" media="all" />
<script type="text/javascript">
$(document).ready(function() {
    $('.jqzoom').jqzoom({
        zoomType: 'innerzoom',
        preloadImages: true,
        alwaysOn: false
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});
</script>