Inserting Avatars in Node View

I've been attempting to have avatars appear next to the author's name in every node displayed on the front page, AKA LiveJournal style. The website is View Online at http://view.rit.edu. I've already installed profile.module to enable avatars.

I'm using a modified version of the Trip theme. Here's the code I've inserted...

<!--   <tr>
        <td class="node-date">

        <!-- Inserts Avatar picture here.  -->
        <?php
        $filename = profile_avatar_path($node->uid,".jpg");
        print "<img class=\"avatar\" src=\"";
          if (!file_exists($filename)) {
                $filename =  profile_avatar_path(1, ".jpg");
          }
        print $filename;
        print "\" align=\"top\">";
        ?>

          <?php print strtr(t("%a | %b"), array("%a" => format_name($node), "%b" => format_date($node->created, "medium"))); ?
>
        </td>
-->

However, it seems to be working only for two users, uid #2 and #3. Can anyone help? Thank you!