Show images in archive/category view?

I’ve been trying to figure out how to show images in the archive and category views, I’ve found out that you’re supposed to change

<?php the_excerpt(); ?>

to

<?php the_content(); ?>

in the archive.php file. Thing is, there’s no excerpt thing in my archive.php file. This is the code in the file:

<?php get_header(); ?>

<div class=”content”>

<?php include(TEMPLATEPATH . ‘/leftbar.php’); ?>

<div id=”primary”>

<?php include (TEMPLATEPATH . ‘/theloop.php’); ?>

</div>

<?php get_sidebar(); ?>

</div>

<?php get_footer(); ?>

Any ideas how I can get images to show? Thanks!