How to add PHP to the loop on multi- and single post pages only?

Hey -

I am using YARPP for realted posts and need to add this

<?php if (function_exists('related_posts')){ ?>
<?php related_posts();?>
<?php }?>

between the bodycontent and the footer. While I could do that in "Style and edit CENTER COLUMN", the related posts will also appear on archive pages, where I don't want them. I put that code between 'bodycopy' and 'pagination' - it works wonderfully if it were not for the archives pages. Is there a way to supress this for specific kinds of pages?