Is it possible to add some sort of java built messenger that could be used when private messaging? Like the Googlemail messenger.

http://img285.imageshack.us/img285/9269/untitled7ra.jpg

It looks something like this, but when you chat a small window will popup in the left corner, about six-ten cm wide and high. It's like windows web-messenger.

So you want it as when you are on your Gmail account that in the bottom right cornor a message appears when some one messages you?
It is a good idea but would require a lot of coding.