http://sn.1w6.org/file/mk-20150528T100546-nz9w4j9.html
@bobjonkman yes - that's one school of thought, but I don't subscribe to that idea. And nested comments lead to all sorts of styling problems. You can also put replies *below* the comment it replies to, and give it an indent that represents the level. That results in a clean HTML structure and is much easier to style.