$(function() {
  $('#change-ja').click(function() {
      $('#lang-select').find('input[type=hidden][name=mode]').val('ja');
      $('#lang-select').submit();
  });
  $('#change-en').click(function() {
      $('#lang-select').find('input[type=hidden][name=mode]').val('en');
      $('#lang-select').submit();
  });
  var price = $('#double').html();
  if ($('#change-ja').hasClass('on')) {
    price = price.split(',').join('');
    price = price.replace('±ß', '');  
    price = price * 2;
    price = price.toString().replace(/([0-9]+?)(?=(?:[0-9]{3})+$)/g , '$1,');
    $('#double').html(price + '±ß');
  } else 
  if ($('#change-en').hasClass('on')) {
    price = price.replace('$', '');  
    price = price * 2;
    $('#double').html('$' + price.toFixed(2));
  }
});


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