have a look at FCKEditor - it is a WYSIWYG editor that
replaces
textareas and allows users to enter formatted text. it has a
"full
screen" button that maximizes selected textarea to full
screen. it is
easy to install and configure, too.
there are a few other ones, like TinyMCE, which let you do
the same in
one way or another.
--
Azadi Saryev
Sabai-dee.com
http://www.sabai-dee.com