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$('a[href^="#"]').click(function() {
      var target = $(this.hash);
      if (target.length == 0) target = $('a[name="' + this.hash.substr(1) + '"]');
      if (target.length == 0) target = $('html');
      $('html, body').animate({ scrollTop: target.offset().top-100 }, 1000);
      return false;
  });