Adsense not showing up.

I have a skyscraper adsense ad in a widget to the right of this page: http://breakingbad.co.uk/ , as you can see it comes up as a blank box.
I typed in this exactly in the widget:

<script type="text/javascript"><!--google_ad_client = "pub-5568215753785564";/* greymatter skyscraper adds */google_ad_slot = "7182870656";google_ad_width = 120;google_ad_height = 600;//--></script><script type="text/javascript"src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>

Any ideas why its not working?

the code is not working for me either.
you need the html or embed code

change it in this way it will be shown put your adsense id in xxxxxxxx slot width and height in ???????
<script type="text/javascript">
google_ad_client = "pub-xxxxxxxxxxxx";
google_ad_slot = "??????????????";
google_ad_width = ???????;
google_ad_height = ??????;
</script>
<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>