Styling of Multiple Sidebars in functions.php

Hi all,

I am building a worpress site that has multiple sidebards that swap and change depending on which page a user is on:

The following code is currently in the functions.php file:

<?php
if ( function_exists('register_sidebars') )
register_sidebars(3);
?>

I have also used on a single sidebar site the following code to style the sidebar widgets:

<?php
if ( function_exists('register_sidebar') )
register_sidebar(array(
'before_widget' => '',
'after_widget' => '',
'before_title' => 'h4',
'after_title' => '/h4',
));
?>

My question is:

How do I get these 2 pieces of code working together so that I can style the widgets of multiple sidebars?

Any help would be appreciated.

Regards.