All the people in Facebook hates new Facebook chat bar. Here is a tricks for disable it and get old one.
Three ways for disable new Facebook chat side bar.

Using add on You can disable new chat side bar and get exactly old one in which you can live online according to created group. 

Using script you can get old Facebook chat bar. you just have to install that script.
And you can use my friends tricks which he invented but it's only for Mozilla Fore fox use.

 1) First way..
Install given below add on in your browser.
Mozilla fire fox user : Install this add on
Chrome user : Install this add on
Opera user : Install this add on

After Installing this add on Just Refresh/Re Load Your Facebook account. You will get your old char side bar.
If you are not getting than, Just restart your browser. And Enjoy.

2) Second way

For Mozilla Firefox users : First install this add-on ( Greasemonkey add-on ).
After that install this script.


After Installing this script just restart your browser and Enjoy old Facebook chat side bar.

For Chrome users : You don’t need an add-on. Just install this script and restart your browser to view changes.

If you use this script and GO OFFLINE than there is no option for ONLINE. So if you want to go ONLINE than, in your Facebook account left side below there is a option GO ONLINE click on it.. So now You are ONLINE. see below image.


3)  Third way..

For Mozilla Firefox if you don't want to install Add-on than, 
Just go to this site : http://www.tweakz.in/
Here is another tricks for removing Facebook new chat side bar.