Hook Location??

[Oreamnos]

I am trying to create a tiny plugin that gets evaluated for each post in a thread.

This code should be executed for each post:

PHP Code:

if ($post['userid'] == 1) {
    $admin_has_posted++;
} 


I want to access the $admin_has_posted variable in the postbit template for the following conditional statement.

<if condition="$admin_has_posted == 1">
do this...
<else />
do that...
</if>

Where should I put this hook so that it is executed properly?

thanks
eric