Hardcode Adsense code into post #1 and post #3

[dzchimp]

I would like to know how to modify templates, to add manually Adsense <script> </script> codes specifically into the first and third post displayed on any page within a thread.

I have tried using the Conditionals plugin to see whether the post number is #1, and if so, it displays Adcode1, if it is post #3, then Adcode2.

There is a problem. I want ads to display on page 2, 3 etc too. If I got for the code which checks post number, then the ads display only on page 1!, I want them on subsequent pages too, serially on the first and third post on every page.

Here's the code I have tried so far.

Code:

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<if $postcounter == '2' then> <tr><div align="center"> <script type="text/javascript"><!-- google_ad_client = "ca-pub-"; /* InthreadPost#2 */ google_ad_slot = ""; google_ad_width = 728; google_ad_height = 90; //--> </script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script> </div> </tr> </if> <if $postcounter == '3' then> <tr> <div align="center"> <script type="text/javascript"><!-- google_ad_client = "ca-pub-cy1"; /* Inpost#1 */ google_ad_slot = ""; google_ad_width = 728; google_ad_height = 90; //--> </script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script>

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This displays ads on Post #1 and Post #2 of page 1. I want ads on Page 2, 3 etc (all pages)