This is just a guess but try this
<td bgcolor="$post[backcolor]" width="90%" valign="top">
<p><normalfont>$post[message]</normalfont></p></td>
<td bgcolor="$post[backcolor]" width="90%" valign="bottom">
$post[attachment]
<p>$post[signature]</p>
<p>$post[editedby]</p>
<p align="left"><smallfont><a href="report.php?s=$session[sessionhash]&postid=$post[postid]">Report Post</a> | $post[iplogged]</smallfont></p></td>
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