using grey box

For using grey box you need to first copy the greybox folder (which you need to download from the website) somewhere inside the root folder of your website where the rest of the content of website is present.

Once you have copied the folder the value of GB_ROOT_DIR is "http://mydomain.com/greybox/" if the domain name of your website is mydomain.com i.e. 
GB_ROOT_DIR = "http://mydomain.com/greybox/"
If you working on localhost it should be GB_ROOT_DIR = "http://localhost/directory/path..
../where/you/have/copied/greybox/"

thnks..................i guess that will do