Google code in a switch function

[DaZKooL]

Ciao

non capisco come mai ma il codice datomi da Google non mi funge nello switch...qualcuno sa dirmi come mai?

                                     <script language="JavaScript">
switch (geoip_country_code())
{
case "AU":
  document.write ('aaa');
  break;
case "AT": 
   document.write ('bbb');
  break;
case "US": 
   document.write ('<script type="text/javascript"><!--
google_ad_client = "pub-3207910364210049";
/* 160x600, created 6/17/08 */
google_ad_slot = "5309963315";
google_ad_width = 160;
google_ad_height = 600;
//->
</script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>');
  break;
default:
   document.write (' ccc')  
}
                                   </script>