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var $pagetop = $('${1}');
$pagetop.css({
  'display': 'none',
  'position': 'fixed',
  'bottom': '20px',
  'right': '20px',
  'z-index': '100'
});
$(window).on('scroll', function() {
  if ( $(this).scrollTop() > 500 ) {
    $pagetop.fadeIn();
  } else {
    $pagetop.fadeOut();
  }
});
$pagetop.on('click', function(e) {
  $('html, body').animate({scrollTop: 0}, 500, 'linear');
  e.preventDefault();
});