Can someone please help me put Google AdSense in my Xanga?

I am a premium user. I used the following JavaScript

<script type="text/javascript"><!--
google_ad_client = "pub-0689994770932095";
google_ad_width = 120;
google_ad_height = 240;
google_ad_format = "120x240_as";
google_ad_channel ="";
google_ad_type = "text_image";
google_color_border = "336699";
google_color_bg = "FFFFFF";
google_color_link = "0000FF";
google_color_url = "008000";
google_color_text = "000000";
//--></script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>

Nothing came out. When I returned to x-tools to check I found out that Xanga chopped-off parts of the script.

Where exactly are you pasteing the code?

Where exactly are you pasteing the code?

I've tried pasting it everywhere but same thing happens when I try to save it. Preview is always good but after saving it JavaScript code becomes caput.

Do you know of any Xanga site with Google AdSense? I can't find any. If you can help me find at least one then I can ask the blogger directly.