This is probably the easiest way to do it:
Code:
<table border="0" cellspacing="0" cellpadding="0" style="width: 61%" align="center">
<if condition="$post[field5]"><tr>
<td align="center"><img border="0" src="images/gender/$post[field5].gif" /><br /></td>
</tr></if>
</tr>
<if condition="$post[field6]"><tr>
<td align="right"><img border="0" src="images/flags/$post[field6].gif" /><br /></td>
</tr></if>
</tr>
</table>
<if condition="$post[userid]">
<span class="smallfont">
<center>
<!-- ONLINE -->
$post[onlinestatus]
<!-- ONLINE -->
</center>
</span>
<br>
^Code changes in red.