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<script>
  function post_rating(value) {
    try {
      var votes = JSON.parse(localStorage.getItem('votes')) || [];
      if (votes && votes.indexOf('<!--GALLERY_ID-->') !== -1) {
        document.getElementById('percent').innerHTML = 'Already voted.';
        return;
      }

      votes.push('<!--GALLERY_ID-->');
      localStorage.setItem('votes', JSON.stringify(votes));
    } catch (e) {
      console.log(e)
    }

    $.get('/index.php', {
        'content_id': '<!--GALLERY_ID-->',
        'action': 'rating',
        'rating': value
      },
      function(data) {
        $('#percent').html('Thank you!');
      }
    );
  } 
  
  </script>