if (!function_exists('ShowAd')) {
function ShowAd($action)
{
$ad = <<<ENDOFAD
<!--Ad advertisement snippet, begin -->
<script type='text/javascript'>
stuff goes here
</script>
<script type='text/javascript' src='http://example/somepath/foo.js'></script>
<!--Ad, end -->
ENDOFAD;
$action->raw($ad);
return true;
}
}