Problema integrazione checkbox privacy in contact form CMS

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Problema integrazione checkbox privacy in contact form CMS

Perdonate il titolo a formato telegrafico.
Ho integrato nel template dei contatti di un tema wordpress il checkbox della privacy ( di default non presente).
Il problema è che ottengo l'errore di validazione (Il consenso è obbligatorio) che io spunti o no il checkbox della Privacy.
Premetto che sono inesperta di PHP.

Posto il codice della pagina ( le parti che ho inserito io sono commentate)

Grazie in anticipo!

[PHP]<?php
/Template Name: Contact form/
?>
<?php global $SMTheme;?>
<?php

if (isset($_POST[$_SESSION['commentinput']])&&$form=$_POST[$_SESSION['commentinput']]) {
    $msg='';
    $error='';
    $errorcode='red';
    $privacy=$_POST['privacy']; // parte che ho inserito
    foreach ($SMTheme->get( 'contactform', 'contactform' ) as $key=>$detail) {
        if ($detail['req']=='required'&&$form[$key]=='') $error.='Field '.$detail['ttl']." is required<br />";
        if ($detail['regex']!=''&&!eregi(stripslashes($detail['regex']),$form[$key])) {
            $error.='Field '.$detail['ttl']." is not valid<br />";
        }
        $msg.=$detail['ttl'].": ".$form[$key]."\r\n";
    }

//parte che ho inserito
if ($privacy !=1) {
$error.='Il consenso è obbligatorio<br />';
}
//fine
$from=($SMTheme->get( 'general','sitename' ))?$SMTheme->get( 'general','sitename' ):get_bloginfo('name');
if ($error=='') {
wp_mail($SMTheme->get( 'contactform', 'email' ), 'Message from '.$from, $msg);
$error=$SMTheme->( 'emailok' );
$errorcode='green';
}
}
?>
<?php
get_header();
?>
<div class='articles'>
<?php
the_post();
?>
<div class='one-post'>
<div id="post-<?php the_ID(); ?>" <?php post_class("post-caption"); ?>>
<?php if (!is_single()&&!is_page()) { ?>
<h2><a href="<?php the_permalink(); ?>" title="<?php printf( $SMTheme->( 'permalink' ), the_title_attribute( 'echo=0' ) ); ?>" class='post_ttl'><?php the_title(); ?></a></h2>
<?php } else { ?>
<h1><?php the_title(); ?></h1>
<?php } ?>
</div>
<div class='post-body'>
<?php
the_content('');
?>

    <?php if ( $SMTheme->get( 'contactform','address' ) != '' ) {?>
    <div class='googlemap waiting'><div id="map_canvas" style="width: 100%; height: 300px;"></div></div>
    
    <script>jQuery(function(){loadGMap('<?php echo $SMTheme->get( 'contactform','address' )?>', 'map_canvas', 16)});</script>

    <?php } ?>

<?php
if ($SMTheme->get( 'contactform', 'email' )) {
?>
<form action='' method='POST' class='feedback'>
<h3><?php echo $SMTheme->( 'feedbackttl' ); ?></h3>
<i><?php echo $SMTheme->( 'feedbackbefore' ); ?></i>
<?php
foreach ($SMTheme->get( 'contactform', 'contactform' ) as $key=>$detail) {
switch ($detail['type']) {
case 'text':
?>
<p><?php echo $detail['ttl']?>: <?php echo ($detail['req']=='required')?'()':''?>
<div class='input'><input type='text' value='' name='<?php echo $key?>'<?php echo ($detail['req']=='required')?" required='true'":''?> /></div>
</p>
<?php
break;
case 'textarea':
?>
<p><?php echo $detail['ttl']?>: <?php echo ($detail['req']=='required')?'()':''?>
<div class='input'><textarea rows='5' name='<?php echo $key?>'<?php echo ($detail['req']=='required')?" required='true'":''?>></textarea></div>
</p>
<?php
break;
}
}
?>

// parte che ho inserito
<p>
<input name="privacy" type="checkbox" id="privacy" value="1" />
<label for="privacy">Dichiaro di aver letto e accettato <a href="Privacy.html">l'informativa sulla Privacy</a></label></p>
// fine
<?php echo ($error!='')?"<p style='color:".$errorcode."'>".$error."</p>":''?>
<center><input type='submit' class='readmore' name='submit' value='<?php echo $SMTheme->_( 'send' );?>' /></center>
</form>
<?php } ?>
<?php if ($SMTheme->get( 'contactform','detailttl' ) != '') {?>
<h3><?php echo $SMTheme->get( 'contactform','detailttl' )?></h3>
<?php } ?>
<?php if ($SMTheme->get( 'contactform','text' )) { ?>
<div style='margin-bottom:20px;'>
<?php echo $SMTheme->get( 'contactform','text' )?>
</div>
<?php }

$details=$SMTheme->get( 'contactform', 'details' );
if (!empty($details)) {

?>
<div id='contact'><ul class='contact-details'>
<?php
foreach ($details as $key=>$detail) {
?>
<li class='contact<?php echo $key?>'><?php echo $detail['content']?></li>
<?php
}
?>
</ul></div>
<style>
<?php
foreach ($SMTheme->get( 'contactform', 'details' ) as $key=>$detail) {
?>
ul.contact-details li.contact<?php echo $key?> {
background:url(<?php echo $detail['img']?>) left top no-repeat;
}
<?php
}
?>
</style>
<?php } else { ?>
<style>
form.feedback { width:100%; }
</style>
<?php
}
?>
</div>
</div>
</div>
<script>
jQuery('.feedback input').each(function(){
jQuery(this).attr('name','<?php echo $_SESSION['commentinput']; ?>['+jQuery(this).attr('name')+']');
});
jQuery('.feedback textarea').each(function(){
jQuery(this).attr('name','<?php echo $_SESSION['commentinput']; ?>['+jQuery(this).attr('name')+']');
});
</script>
<?php
get_footer();
?>[/PHP]