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Secondly, I modified the cache_hooks.php file to do the "if statement" and perform the swap.

        if(pun_pm_unread_messages_integer() > 0)
            {
                $visit_elements['<!-- forum_visit -->'] = preg_replace('#(<p id="visit-links" class="options">.*?)(</p>)#', '$1 <span><a href="'.forum_link($forum_url['pun_pm_inbox']).'"><img src="myimage.gif"></a></span>$2', $visit_elements['<!-- forum_visit -->']);            
            }
        else
            {
                $visit_elements['<!-- forum_visit -->'] = preg_replace('#(<p id="visit-links" class="options">.*?)(</p>)#', '$1 <span><a href="'.forum_link($forum_url['pun_pm_inbox']).'">'.pun_pm_unread_messages().'</a></span>$2', $visit_elements['<!-- forum_visit -->']);    
            }

I realize there are always many ways to solve a problem and this is just one.  I also realize that it's another database query that needs to happen, but performance isn't an issue.  This is for a small forum with maybe 15-20 active posters and only 3-4 online at a time.  It may not be the best or what you think is the best, but I understand it and like it.  Mission accomplished!

Thanks for the input again Garcia/Sirena.