Hi,

A couple of things I came across that might be problems:

1) fnEscapeHTML should add /g to the regex's:
return html.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g,
'&gt;');

2) The line in fnAddNote: newArea.appendChild(newID);
should be: newNote.appendChild(newID);

3) Also, when adding a new note, I think you need to set the title
attribute of the 'fn-note-id' span to whatever the noteID is in
fnEditComplete, or people will get errors when they try to edit a note
that they've just added in the same session.

BTW, I love this app you've created - thank you! I'm in the process
of modifying it to work with MediaWiki software so people can add
annotations to uploaded images. It's been a pretty straightforward
modification. If you're interested, I'll give you the modification
when I'm done.