iRev on line Page Editor

[Sivakatirswami]

I'm wondering if anyone has already build a page editor, kind of like a 
wiki thing... where you are on an iRev page, you click a button and  (in 
my case) you get the html content for

<div id="maincontent">

# all the content of the page minus fixed headers and footers etc.
# the area to be edited

</div>

put that into a form field for editing, then send it back and update the 
page.

I suspect someone has done this already and if so can you share your 
page code?