Ciao a tutti, ho questa pagina di codice

Codice PHP:
<?php
/*
Template Name: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
*/
?>  
<?php get_header();?>

    <?php
      $info_address 
get_option('ecobiz_info_address');
      
$info_phone get_option('ecobiz_info_phone');
      
$info_fax get_option('ecobiz_info_fax');
      
$info_emailget_option('ecobiz_info_email');
      
$info_website get_option('ecobiz_info_website');
      
$info_latitude get_option('ecobiz_info_latitude') ? get_option('ecobiz_info_latitude') : "-6.229555086277892";
      
$info_longitude get_option('ecobiz_info_longitude') ? get_option('ecobiz_info_longitude') : "106.82551860809326";
    
?>
                
      <?php
        
global $post;
        
$page_slideshow_type get_post_meta($post->ID,"_page_slideshow_type",true);
        
$slideshow_cat get_post_meta($post->ID,"_page_slideshow_category",true);
        
$heading_image get_post_meta($post->ID,"_heading_image",true);
        
$bgtext_heading_position get_post_meta($post->ID,"_bgtext_heading_position",true);
        
$page_short_desc get_post_meta($post->ID,"_page_short_desc",true);
        
$slideshow_order get_option('ecobiz_slideshow_order') ? get_option('ecobiz_slideshow_order') : "date";
      
?>      
      <?php if ($page_slideshow_type =="" || !isset($page_slideshow_type) || $page_slideshow_type == "None" ) { ?>
         
        <div id="page-heading">
          [img]<?php echo $heading_image $heading_image get_template_directory_uri().'/images/page-heading.jpg';?>[/img]
          <div class="heading-text<?php if ($bgtext_heading_position =="right") echo '-right';?>">
            <h3><?php the_title();?></h3>
            

<?php echo $page_short_desc;?></p>
          </div>
        </div>
        
      <?php } else { ?>
        <?php
        
if ($page_slideshow_type !="None"  || $page_slideshow_type == "Nivo slider" || $page_slideshow_type == "Kwicks slider") {
          if (
$page_slideshow_type == "Nivo slider") {
            
get_nivoslider($slideshow_cat,$slideshow_order);
          } else if (
$page_slideshow_type == "Kwicks slider") {
            
get_kwicksslider($slideshow_cat,$slideshow_order);
          }
        }
        
?>
      <?php ?>
      <div class="clear"></div>
      
      <div class="center">
        <?php $enable_breadcrumbs get_option('ecobiz_enable_breadcrumb');?>
        <?php if ($enable_breadcrumbs =="true") { ?>
          <div class="breadcrumb">
            <?php if ( function_exists'breadcrumbs_plus' ) ) breadcrumbs_plus(); ?>
          </div>
        <?php ?>
        
        <div class="maincontent-full">
          
          <div id="conctactleft">
            <?php if (have_posts()) : ?>
            <?php while (have_posts()) : the_post();?>
            <?php the_content();?>
            <?php endwhile;?>
            <?php endif;?>
            
            <?php $success_msg  get_option('ecobiz_success_msg');?>
            <div class="success-message"><?php echo ($success_msg) ? stripslashes($success_msg) : __("Your message has been sent successfully. Thank you!",'ecobiz');?></div>
            
            <div id="maincontactform">
              <form action="#" id="contactform"> 
              <div>
                <label for="contactname"><?php echo __('Name ','ecobiz');?></label>
                <input type="text" name="contactname" class="textfield" id="contactname" value=""  /><span class="require"> *</span>
                <label for="contactsubject"><?php echo __('Subject ','ecobiz');?></label>
                <input type="text" name="contactsubject" class="textfield" id="contactsubject" value=""/><span class="require"> *</span>
                <label for="contactemail"><?php echo __('E-mail ','ecobiz');?></label> 
                <input type="text" name="contactemail" class="textfield" id="contactemail" value="" /><span class="require"> *</span>
                <label for="contactmessage"><?php echo __('Message ','ecobiz');?></label> 
                <textarea name="contactmessage" id="contactmessage" class="textarea" cols="8" rows="12"></textarea><span class="require"> *</span>
                <div class="clear"></div>
                <input type="hidden" name="siteurl" id="siteurl" value="<?php echo get_template_directory_uri();?>" />   
                <input type="hidden" name="sendto" id="sendto" value="<?php echo (get_option('ecobiz_info_email')) ? get_option('ecobiz_info_email') : get_option('admin_email');?>" />           
                [url="#"]<span><?php echo __('SEND','ecobiz');?></span>[/url]
                <input type="checkbox" name="informativa" value="informtiva">Marcando questa casella, accetti l'informativa sulla privacy
<span class="require"> *</span>
                <span class="loading" style="display: none;"><?php echo __('Please wait..','ecobiz');?></span>
              </div>
              </form>
            </div>
          </div>
          
          
          
          <div id="contactright">
            
            <div id="map" class="imgbox">
              <?php echo theme_widget_text_shortcode(do_shortcode('[gmap width="424" height="246" latitude="'.$info_latitude.'" longitude="'.$info_longitude.'"  controls="true" zoomcontrol="true" zoom="15" html="'.$info_address.'" popup="true"]'));?>
            </div>
                
            <ul class="contactinfo">[*]
              <?php echo $info_address stripslashes($info_address) : "
              Jln. Damai menuju Syurga No. 14,

            Jakarta 20035,

            Indonesia"
;?>[*][b]<?php echo __('Phone','ecobiz');?>[/b] : <?php echo $info_phone;?>
              <?php if ($info_fax !="") { ?>[*][b]<?php echo __('Fax','ecobiz');?>[/b] : <?php echo $info_fax;?>
              <?php ?>[*][b]<?php echo __('Email','ecobiz');?>[/b] : [email="<?php echo $info_email $info_email "]"><?php echo $info_email;?>[/email]

              [b]<?php echo __('Website','ecobiz');?>[/b] : [url="http://<?php echo $info_website $info_website "]"><?php echo $info_website;?>[/url][/list]
            <div class="clear"></div>
          </div>
                    
        </div>
        
    
<?php get_footer();?>
La mia necessità è inserire accanto al tasto per inviare il messaggio, una checkbox che se non viene flaggata, non fa inviare il messaggio.

Il codice da cui ero partito era quello della checkbox classica, però non riesco a collegarlo bene al tasto. Potete vedere dove ho inserito la checkbox provvisoria all'interno del sito cercando checkbox, se vi serve il sito dove poter vedere graficamente la pagina, basta chiedere.

Mi potete suggerire come fare? Grazie