Page load problem with AdSense after posting..

[rhinoForums.net]

I previously had this code in my postbit template, at the very bottom:

<if condition="($post[postcount] % $vboptions[maxposts] == 1) or ($post[islastshown])">
<p align="center">
<script type="text/javascript"><!--
google_ad_client = "pub-6536067409393130";
google_ad_width = 728;
google_ad_height = 90;
google_ad_format = "728x90_as";
google_ad_type = "text";
google_ad_channel = "";
google_color_border = "4C4C4C";
google_color_bg = "333333";
google_color_link = "A9501B";
google_color_text = "B3B3B3";
google_color_url = "008000";
//--></script>
<script type="text/javascript"
  src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</if>

When I was using this code, after posting you would be taken to a blank page, I assume because of the adsense that was set to show before the last post. Is there a way to accomplish this without having the problem I am seeing? I just want my adsense to display after the first post and before the last post on a page.

Perhaps I need to specify a post number, instead of allowing the adsense to move dynamically in front of the last post...

Thanks for any help