[Simon Lloyd]

In your post bit replace verythinge between <!-- message --> and <!-- message/ --> with

<!-- message -->

<if condition="$show['search_engine']">
	<div id="post_message_$post[postid]">
		$ad_location[ad_showthread_firstpost_start]
		$post[message]
	</div>        
</if>
<if condition="$show['guest']">
	
		<div id="post_message_$post[postid]">
			$ad_location[ad_showthread_firstpost_start]
			SORRY YOU MAY NOT VIEW THIS!
		</div>


<else />
<div id="post_message_$post[postid]">
		$ad_location[ad_showthread_firstpost_start]
		$post[message]
	</div></if>
<!--/ message -->

it should be what you need.