Show/Hide sideboxes based on page

[numinix]

How would I do this to make a banner only display on ezpages?

Here is what I have so far in the tpl_main_page.php:

<!--bof-banner #5 display -->
<?php
 $show_ezpages = false;
 if (isset($_GET['pages_id']) and zen_pages_id_valid($_GET['pages_id'])) {
        $show_ezpages = true;
    }
  if ($show_ezpages == true) {
   if (SHOW_BANNERS_GROUP_SET5 != '' && $banner = zen_banner_exists('dynamic', SHOW_BANNERS_GROUP_SET5)) {
     if ($banner->RecordCount() > 0) {
    
?>
<div id="bannerFive" class="banners"><?php echo zen_display_banner('static', $banner); ?></div>
<?php
    }
  }
}
?>
<!--eof-banner #5 display -->

zen_pages_id_valid is a clone of zen_products_id_valid

Right now I'm getting all false and the banner does not display... Hopefully someone can clean up my mess!