Replace new chatbar to old chatbar in FACEBOOK

here we see that how to remove new facebook chat bar and get old facebook chatbar with some easy or few steps.
In newer version of facebook the facebook chat bar is not desireble as old chat bar in facebook.
now here are some few step to get old chat bar in facebook.
To get old chat bar first of all install facebook sidebar chat reversion.
to install facebook sidebar chat reversion open this link:
http://userscripts.org/scripts/show/107159

now open this link in new tab.
you can see this type of image on your browser.

now click on install buton and get old chat bar in facebook.

but here for mozilla firefox has a problem.
for mozilla firefox user ocomplete uper side process then open this link :https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/

this is link of another (second) addones .it is install on your mozilla firefox then start facebook you can see your old facebook chat box.