Showing Only Excerpt on Index Page

I’m somewhat new to WP, but have been getting everything I need to do figured out pretty good. There’s just one thing I can’t seem to figure out, that’s how to make it just display the Excerpts of articles on the index page with the “read more…” or whatever down below.

I’m using the Aspire theme by Infocreek. In it the index.php file has this code:

<div class=”entry font-resize”>

<?php if (function_exists(‘the_excerpt_reloaded’))
the_excerpt_reloaded(145, ‘<img>’, ‘excerpt’, TRUE, ‘Read the full post…’);
else
the_content(‘Read the rest of this entry ?’);
?>
<?php the_tags( ‘<p>Tags: ‘, ‘, ‘, ‘</p>’); ?>
</div>

I understand enough to know that his is related, but don’t know PHP enough to know if that controls what I’m looking for or not. If so, how I should modify it to work correctly?

Thanks in advance for any help!