Previous/Next links

I was trying to find a way to add the previous and last links in my entries, but I only want it to be visible in the individual pages, and not the main index. I got this off the codec, and took an arrow off : <?php previous_post(‘« %’, ”, ‘yes’); ?> | <?php next_post(‘% » ‘, ”, ‘yes’); ?>

I stuck it somewhere in “the loop,” (below the the the_content in my main template page), and it worked… somewhat. I like how it is in the individual page, but in the main index, there’s this | floating at the end of my posts. How can I get rid of that on the main index, but not in the individual posts?

Oh, and I’m modifying “The Pool” theme.