How to display ads in first post only and on the top right ?

[ngannguyen]

Hi,
I would like to place ads in the first post only and on the top right , I used this script:
............................................................
ad_message_body
<xen:if is="{$post.position} == 0">
<div style="float: right">
ad code
</div>
.............................................................
But ads displayed in many posts below first post, this took so much time to load the site/thread and caused duplicate posting
I did something wrong ?
How can I fix...

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