You'll need to do a partial page refresh on that bit of the page e.g. using RichFaces.
Or do it manually using Remoting.
View the original post :
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4085440#...
Reply to the post :
http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...