How do I add a footnote on a web page?

In HTMLHow do I add a footnote on a web page?
There's no pre-defined way to do it in HTML, the way I do it is to put a link to the footnote in the main text, then a link back from the footnote to the point in the text where the link came from. You do this with named anchors.





See this page for some examples (view source on the page):





http://www.dotrob.com/essays/essay4.html