Gallery masonry open new tab

Hi, i would like to open links in a new tab with gallery masonry but only a specific one gallery. I found this code but it applies to all gallery masonry:

function add_custom_target(){
?>
<script>
jQuery(window).load(function(){
jQuery(‘.av-masonry-container a ‘).attr(‘target’,’_blank’);
});
</script>
<?php
}
add_action(‘wp_footer’, ‘add_custom_target’);

How to identifies a specific one gallery?

Thanks,