How I can make the iFrame ads from site A to site B
not like this: <iframe src="http://www.site.com"></iframe>
Example:

site A
<script type="text/javascript"><!--
google_ad_client = "ca-pub-3434343507";
/* site */
google_ad_slot = "343435270";
google_ad_width = 728;
google_ad_height = 90;
//-->
</script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>

site B
--iFrame--
<script type="text/javascript"><!--
google_ad_client = "ca-pub-3434343507";
/* site */
google_ad_slot = "343435270";
google_ad_width = 728;
google_ad_height = 90;
//-->
</script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
--iFrame--