What change on a textarea

Giganews Newsgroups
Subject: What change on a textarea
Posted by:  Alexandre Flament (flame…@imag.fr)
Date: Wed, 30 Jul 2003

I would like to know what change on textarea :
- when user change content with keyboard
- when user drag/drop some text to textarea

By what change, I mean for example, this kind of event :
- at offset 153
- user add this text "azerty"

Is there a way to do it with ECMA ? or perhaps with specific extension
of mozilla  or IE ?