Como remover essas barras vazias?

Olá.

Eu gostaria de remover o que está dentro do retângulo vermelho para deixar meu fórum mais clean:



Tentei remover uns códigos, mas sem sucesso, removi coisas erradas, depois coloquei de volta. O código:

--------------------------------------------------------------------
<br>
{BOARD_INDEX}
<table width="100%" border="0" cellspacing="2" cellpadding="0" align="center">
<tr>
<td align="left" valign="middle" width="50">
<!-- BEGIN switch_user_authpost -->
<a href="{U_POST_NEW_TOPIC}" rel="nofollow"><img src="{POST_IMG}" id="{POST_IMG_ID}" alt="{L_POST_NEW_TOPIC}" border="0" /></a>
<!-- END switch_user_authpost -->
</td>
<td class="nav" valign="middle" width="100%"><div class="nav"><a class="nav" href="{U_INDEX}">{L_INDEX}</a>{NAV_CAT_DESC}</div></td>
<td class="gensmall" align="right" valign="bottom" nowrap="nowrap">
<span class="nav">
<script type="text/javascript">
//<![CDATA[

//]]>
</script>
</span>
</td>
</tr>
</table>
{TOPICS_LIST_BOX}
<div id="info_open" style="display:''">
<table class="forumline" width="100%" border="0" cellspacing="1" cellpadding="0">
<tr>
<td class="catBottom" colspan="2" height="28">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
</table>
</td>
</tr>
</table>
</div>

<div id="info_close" style="display:none">
<table class="forumline" width="100%" border="0" cellspacing="1" cellpadding="0">
<tr>
<td class="row1" colspan="2" align="right" valign="top"><span class="gensmall"><a href="{U_MARK_READ}">{L_MARK_TOPICS_READ}</a></span></td>
</tr>
<tr>
<td class="row2" colspan="2" valign="top"><span class="gensmall"><b>{LOGGED_IN_USER_LIST}</b></span></td>
</tr>
<tr>
<td class="catBottom" colspan="2" height="28">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="nav" valign="middle" width="100%"><span class="nav"> <a class="nav" href="{U_INDEX}">{L_INDEX}</a>{NAV_CAT_DESC_SECOND}</span></td>
<td align="right" valign="middle"><span class="gensmall"><a href="javascript:ShowHideLayer('info_open','info_close');"><img src="{TABS_MORE_IMG}" alt="+" align="middle" border="0" /></a></span></td>
</tr>
</table>
</td>
</tr>
</table>
</div>
<form action="{S_JUMPBOX_ACTION}" method="get" name="jumpbox" onsubmit="if(document.jumpbox.f.value == -1){return false;}">
<table width="100%" border="0" cellspacing="2" cellpadding="0" align="center">
<tr>

<td align="left" valign="middle" width="50">
<!-- BEGIN switch_user_logged_in -->
<!-- END switch_user_logged_in -->
</tr>
<!-- BEGIN switch_legend -->
<tr>
<td colspan="2">
<table border="0" cellpadding="6" cellspacing="2" align="center">
<tr>
</tr>
</table>
</td>
</tr>
<!-- END switch_legend -->
</table>
</form>
--------------------------------------------------------------------

Grato desde já!