Problem adding ads to site…

I know this is a real simple question, forgive my programming ignorance, but I cant seem to figure out the proper place to put in ad code for Google AdSense. It’s simple JavaScript stuff.

Can anyone please tell me where I need to input the following code:
<script type=”text/javascript”><!–
google_ad_client = “pub-******************”;
google_ad_width = 120;
google_ad_height = 600;
google_ad_format = “120x600_as”;
google_ad_type = “text_image”;
google_ad_channel =””;
//–></script>
<script type=”text/javascript”
src=”http://pagead2.googlesyndication.com/pagead/show_ads.js”&gt;
</script>

Much thanks ~