Функция удаления топиков в разделе форума

<?php
$mod_options = <<<DATA
<form method="post" name="ModOptions" action="postings.php">
<input type="hidden" name="forum" value="{$forum_id}">
<input type="hidden" name="topic" value="{$topic_id}">
<input type="hidden" name="postkey" value="">
<select name="action" style="font-weight:bold;">
<option value="-1" style="color:black">---- {$fm->LANG['MsgsOptions']} ----</option>
<option value="delselected">{$fm->LANG['DelSelected']}</option>
<option value="innew">{$fm->LANG['MoveInNew']}</option>
<option value="inexists">{$fm->LANG['MoveInExists']}</option>
<option value="delattach">{$fm->LANG['AttachDelSelected']}</option>
<option value="-1" style="color:black"></option>
<option value="-1" style="color:black">---- {$fm->LANG['TopicOptions']} ----</option>
<option value="edittopic">{$fm->LANG['EditTitle']}</option>
<option value="{$do}">{$fm->LANG['Unlock']}</option>
{$pin}
<option value="delete">{$fm->LANG['Delete']}</option>
</select>&nbsp;
<input name="chek" type="checkbox" onClick="ChekUncheck()" title="{$fm->LANG['SelectAll']}"> &nbsp;
<input type="button" value="Go!" onClick="CheckFormAction();" />
</form>
DATA;
?>

<?php
$mod_options = <<<DATA
<form method="post" name="ModOptions" action="postings.php">
<input type="hidden" name="forum" value="{$forum_id}">
<input type="hidden" name="topic" value="{$topic_id}">
<input type="hidden" name="postkey" value="">
<select name="action" style="font-weight:bold;">
<option value="delete">{$fm->LANG['Delete']}</option>
<option value="delselected">{$fm->LANG['DelSelected']}</option>
<option value="innew">{$fm->LANG['MoveInNew']}</option>
<option value="inexists">{$fm->LANG['MoveInExists']}</option>
<option value="delattach">{$fm->LANG['AttachDelSelected']}</option>
<option value="edittopic">{$fm->LANG['EditTitle']}</option>
<option value="{$do}">{$fm->LANG['Unlock']}</option>
{$pin}
</select>&nbsp;
<input name="chek" type="checkbox" onClick="ChekUncheck()" title="{$fm->LANG['SelectAll']}"> &nbsp;
<input type="button" value="Go!" onClick="CheckFormAction();" />
</form>
DATA;
?>

{$mod_options}

{$topic_data}

<input type="button" value="Go!" onClick="CheckFormAction();" />

<input type="button" value="{$fm->LANG['Go']}" onClick="CheckFormAction();" />

$this->LANG['Go'] = 'Применить';