Adsense into Dreamweaver

I am building a website in Dreamweaver CS3 V9.0


But anyway, I need help inserting the adsense code. Everytime I insert the code, it doesnt do anything. Its like the code isnt right.

<script type="text/javascript"><!--
google_ad_client = "pub-4258843381128172";
/* 728x90, created 4/11/10 */
google_ad_slot = "7266764003";
google_ad_width = 728;
google_ad_height = 90;
//-->
</script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>

Code (markup):

Theres the code, Im 100% sure everything is good with it. Does anyone have any ideas or had the same problem and fixed it?

Thanks alot

AkAmrdr
Dr. Design