Adsense placment question

[beastybob]

I'm tiring to get my adsense to show at the bottom of the first post in a thread and the last post of each page.

I have got it displayed below the first post fine but I can not make it show on the last post of each page I can only get it to show on the last post of each thread.

I'm using this code:


Code:
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Anyone know what I'm doing wrong?

My forum if it helps : www.feedthegeeks.com/forum/

Thanks