snippet.php

<script src="/js/jquery.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript" charset="utf-8">
    var $jq = jQuery.noConflict();
    $jq(document).ready(function(){
        $jq("input[name^='STGenres']").each(function(){
            $jq(this).change(function(){
                $jq(this).parent().prevAll("input[name^='STGenre_groups']").attr('checked', true);
                
            });
        });
    });
</script>