little trouble following tutorial on sidebox images

Hi. I'm having a little trouble following this tutorial on replacing the sidebar headings with an image. I hope someone can help.

What happens after I follow the instructions is that the "categories" title, which is the one I want to replace with an image, turns into a broken image of a zen-cart banner ad "Powered by Zen Cart... etc."

So, I think I might have edited wrong. Here's what I have to add:

define('BOX_HEADING_CATEGORIES', 'your_graphic_image.???');

And so what I entered was:

define('BOX_HEADING_CATEGORIES', 'includes/templates/premium1c/images/categories.gif');

THEN, what I have to do, is replace the text in the modules with this:

$title = zen_image($template->get_template_dir(BOX_HEADING_CATEGORIES, DIR_WS_TEMPLATE, $current_page_base,'images'). '/' . BOX_HEADING_CATEGORIES, HEADER_ALT_TEXT);

I'm sure that I should modify that, by I have no idea how.

Does anyone know?

Thank you!

ilsita

Update!

I figured this out. I fixed it by not including the whole source of the image, but just using the image name. So:

define('BOX_HEADING_CATEGORIES', 'categories.gif');

So, once again I make things more complicated than they are.