[Michael Biddle]

Well depending on the script, put at bottom of navbar template like this:

<if condition="THIS_SCRIPT == 'defined page'">ad code here</if>

Where defined page you can find in the actual file itself

In attachments for example its:

define('THIS_SCRIPT', 'attachment');

So you would use

<if condition="THIS_SCRIPT == 'attachment'">ad code here</if>

Hope this helps