I want a different sidebar to appear on specific pages

I created a special category page as per instructions on the Category Templates page. It’s now called category-33.php

I would now like to create a sidebar especially for it, so I made a sidebar33.php, changed <?php get_sidebar(); ?> on the category-33.php file into <?php get_sidebar33(); ?>then went into wp-includes/template-functions-general.php and added this line:


function get_sidebar33() {
if ( file_exists( TEMPLATEPATH . '/sidebar33.php') )
load_template( TEMPLATEPATH . '/sidebar33.php');
else
load_template( ABSPATH . 'wp-content/themes/default/sidebar.php');
}


Guess what? It doesn’t work.

So my questions:

1. My theme (Dandyna’s I Love Colours) does not have a function.php file. Where do I find the functions for my theme?
2. help?