HabrJS Source

// Source for http://pastebin.com/qVqNYPzr

// Collect posts and its marks
var comments=$$('li.comment_holder'), marks=[];
comments.each(function(item) {
  item.div=item.getChildren('.entry-content')[0].getChildren('.entry-content-only')[0];
  item.mark=parseInt(item.getChildren('.msg-meta')[0].getElements('li.mark span')[0].innerHTML.replace('–', '-'));
  marks.push(item.mark);
});

// Get threshold
marks=marks.sort(function(a, b) {return a - b});
var l=parseInt(marks.length * 0.05);
var max=marks[marks.length - l];

// Hide unwanted
comments.each(function(item) {
  if (item.mark < max)
    item.div.addClass('bad5');
});