Joomla - Custom CSS dependant on active menu item & children
Author: Max Lynam | June 2012 | max@OSguru.com.au
/*************************************************************/
Edit the file "index.php" in your default template directory.
The alias of your active item will be inserted as a class on your body.

If the menu item alias is "home", you can then style everything on that page using the class body.home page.

example usage:
/**** CSS File ****/

body rightcolumn
{
  /* rule for every page */
}

body.home rightcolumn
{
 /* different rule for homepage */