Am I right in thinking the theme author has built his own ads into his theme?
It will probably be in the postbit template.
You need to remove:
<script type="text/javascript"><!--
google_ad_client = "pub-1743520241645285";
/* 728x15, created 2/22/10 */
google_ad_slot = "6865928278";
google_ad_width = 728;
google_ad_height = 15;
//-->
</script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
It should be in the postbit template.