[Lynne]

It's hard to tell exactly what you want since you provided no image, but if you just want the post message centered, find this in your postbit(_legacy):

<!-- message -->
        <div id="post_message_$post[postid]">$post[message]</div>
        <!-- / message -->

And change it to:

<!-- message -->
        <div id="post_message_$post[postid]" style="text-align:center;">$post[message]</div>
        <!-- / message -->

That may or may not work for IE. Another method you may try is:

<!-- message -->
         <div id="post_message_$post[postid]" style="margin-left: auto; margin-right: auto;">$post[message]</div>
         <!-- / message -->