it would be great if you could add this to every page:

$main_smarty->assign('body_args', 'id="profile"');
(an example for profile.php)

it will generate <body id="profile">

this is very usefull when styling with CSS.
for example, if you create a tabbed navigation you can make the tab corresponding to the current page active by applying a different style to lets say body#profile #nav a.profile....)