CentOS - Jun 2008 - Regd: Linux Boot-Up Front-end show details and hide details configuration files

Dear All,

   During CentOS Boot-Up user can See all of the standard messages 
within this front-end by clicking on the 'show details' link.
   and hide the standard messages within this front-end by clicking on 
the 'hide details' link.
 
   I need to implement my own software like this, so i need yours help
   I tried to google-out and i can't find out the show details and hide 
details configuration files
   Please, do the needful.

Regards
-S.Balaji