Hey Barry,
That code is in the source of the site at the bottom ala:
<span style="display:none">PHVsPjxsaT48c3Ryb25nPndvb19hZ etc. etc.
If you run that stuff through a Base64 decoder (
Base 64 Decoder) you'll see what it is.
Looks like the theme engine slappin invisible adverts in. Will fix it in a min