Using a web form to edit the content is different than what you were asking for. :) I've doen some work on WYSIWYG doc handling, but not with Word file format. Using HTML and JS, it's barely possible, but Java should be a possibility.

You might see if the OO.org folks are considering adding an HTTP portal to their stuff so OO becomes a 'browser'. That would solve your problem and add a neat twist to OO. Given that it's Open Source (assuming you can d/l all the source incl. the Java!!!) somebody is sure to take it on.